How to block sending mails?
Clash Royale CLAN TAG#URR8PPP
up vote
1
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I want to block specific user from sending emails. I tried doing these things which did not help:
- Commented user in
/etc/passwd - Wrote
passwd -l userand restartedsendmailservice.
User can't receive mails - that's OK, but they still may send mails. I use Sendmail (port 25) and Dovecot (port 110 POP3).
Any ideas to block a user from sending mails?
sendmail
edited Aug 8 at 10:05
slm♦
238k65491662
asked Aug 8 at 9:39
it dev
244
add a comment |Â
up vote
1
down vote
favorite
I want to block specific user from sending emails. I tried doing these things which did not help:
- Commented user in
/etc/passwd - Wrote
passwd -l userand restartedsendmailservice.
User can't receive mails - that's OK, but they still may send mails. I use Sendmail (port 25) and Dovecot (port 110 POP3).
Any ideas to block a user from sending mails?
sendmail
edited Aug 8 at 10:05
slm♦
238k65491662
asked Aug 8 at 9:39
it dev
244
1
The purported duplicate question is about a Posfix system. This question is about, as it says, a Sendmail system. It is not the same answer for both.
– JdeBP
Aug 8 at 10:09
Then it is not dupe.
– peterh
Aug 8 at 19:55
add a comment |Â
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I want to block specific user from sending emails. I tried doing these things which did not help:
- Commented user in
/etc/passwd - Wrote
passwd -l userand restartedsendmailservice.
User can't receive mails - that's OK, but they still may send mails. I use Sendmail (port 25) and Dovecot (port 110 POP3).
Any ideas to block a user from sending mails?
sendmail
edited Aug 8 at 10:05
slm♦
238k65491662
asked Aug 8 at 9:39
it dev
244
I want to block specific user from sending emails. I tried doing these things which did not help:
- Commented user in
/etc/passwd - Wrote
passwd -l userand restartedsendmailservice.
User can't receive mails - that's OK, but they still may send mails. I use Sendmail (port 25) and Dovecot (port 110 POP3).
Any ideas to block a user from sending mails?
sendmail
sendmail
edited Aug 8 at 10:05
slm♦
238k65491662
asked Aug 8 at 9:39
it dev
244
edited Aug 8 at 10:05
slm♦
238k65491662
asked Aug 8 at 9:39
it dev
244
edited Aug 8 at 10:05
slm♦
238k65491662
edited Aug 8 at 10:05
slm♦
238k65491662
edited Aug 8 at 10:05
slm♦
238k65491662
238k65491662
asked Aug 8 at 9:39
it dev
244
asked Aug 8 at 9:39
it dev
244
asked Aug 8 at 9:39
it dev
244
244
1
The purported duplicate question is about a Posfix system. This question is about, as it says, a Sendmail system. It is not the same answer for both.
– JdeBP
Aug 8 at 10:09
Then it is not dupe.
– peterh
Aug 8 at 19:55
add a comment |Â
1
The purported duplicate question is about a Posfix system. This question is about, as it says, a Sendmail system. It is not the same answer for both.
– JdeBP
Aug 8 at 10:09
Then it is not dupe.
– peterh
Aug 8 at 19:55
1
1
The purported duplicate question is about a Posfix system. This question is about, as it says, a Sendmail system. It is not the same answer for both.
– JdeBP
Aug 8 at 10:09
The purported duplicate question is about a Posfix system. This question is about, as it says, a Sendmail system. It is not the same answer for both.
– JdeBP
Aug 8 at 10:09
Then it is not dupe.
– peterh
Aug 8 at 19:55
Then it is not dupe.
– peterh
Aug 8 at 19:55
add a comment |Â
1 Answer
1
active
oldest
votes
up vote
1
down vote
In Sendmail you can add this user to the /etc/mail/access database file (access.db) to disallow them from sending emails:
Put their address in the file /etc/mail/access:
user@my-domain.com REJECT
Then rebuild it:
$ makemap hash /etc/mail/access.db < /etc/mail/access
NOTE: From what I remember you may have to put several permutations of their email address in this file to stop them. so things like user@localhost, etc.
I do not have a sendmail setup handy, but you can typically use a Makefile command that's provided in newer implementations of sendmail.
For more controlling the sending/receiving via Sendmail you can do more specific controls like this in this file:
To:a1@server.vikas.com REJECT # Reject a1 user from recieving mails
From:a1@server.vikas.com REJECT # Reject a1 user from sending mails
References
- How to enable/disable user's access to email (sendmail)
answered Aug 8 at 10:11
slm♦
238k65491662
Is it necessary to rebuild it? I am a little frightened to use makemap command
– it dev
Aug 8 at 10:22
I seem to remember that restarting the sendmail service did this as well. But yeah you typically have to rebuild these files in order for sendmail to use them. BTW I just reinstalled sendmail on CentOS 7 and it does still come with amakecommand, so you should be able to run that if your setup has it. If you're pensive to do this, back up the whole/etc/maildir 1st.
– slm♦
Aug 8 at 10:23
1
Good old sendmail...I prefered to deal with it editing .mc files...it would be interesting understanding the problem of the user, blocking users in sendmail wont prevent users/malware scripts form sending email/spam via TCP/25 if the infra-structure allows it.
– Rui F Ribeiro
Aug 8 at 10:48
@slm, may I only restart sendmail service after REJECTING user in access file? Will it help?
– it dev
Aug 8 at 11:13
@itdev - my suggestion was to try doing a restart after adding REJECT entry to see if it triggers a rebuild ofaccess.db, but I'm 90% sure that you have to rebuild these manually using eitherrehashor themakecommand.
– slm♦
Aug 8 at 11:15
 |Â
show 3 more comments
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
In Sendmail you can add this user to the /etc/mail/access database file (access.db) to disallow them from sending emails:
Put their address in the file /etc/mail/access:
user@my-domain.com REJECT
Then rebuild it:
$ makemap hash /etc/mail/access.db < /etc/mail/access
NOTE: From what I remember you may have to put several permutations of their email address in this file to stop them. so things like user@localhost, etc.
I do not have a sendmail setup handy, but you can typically use a Makefile command that's provided in newer implementations of sendmail.
For more controlling the sending/receiving via Sendmail you can do more specific controls like this in this file:
To:a1@server.vikas.com REJECT # Reject a1 user from recieving mails
From:a1@server.vikas.com REJECT # Reject a1 user from sending mails
References
- How to enable/disable user's access to email (sendmail)
answered Aug 8 at 10:11
slm♦
238k65491662
Is it necessary to rebuild it? I am a little frightened to use makemap command
– it dev
Aug 8 at 10:22
I seem to remember that restarting the sendmail service did this as well. But yeah you typically have to rebuild these files in order for sendmail to use them. BTW I just reinstalled sendmail on CentOS 7 and it does still come with amakecommand, so you should be able to run that if your setup has it. If you're pensive to do this, back up the whole/etc/maildir 1st.
– slm♦
Aug 8 at 10:23
1
Good old sendmail...I prefered to deal with it editing .mc files...it would be interesting understanding the problem of the user, blocking users in sendmail wont prevent users/malware scripts form sending email/spam via TCP/25 if the infra-structure allows it.
– Rui F Ribeiro
Aug 8 at 10:48
@slm, may I only restart sendmail service after REJECTING user in access file? Will it help?
– it dev
Aug 8 at 11:13
@itdev - my suggestion was to try doing a restart after adding REJECT entry to see if it triggers a rebuild ofaccess.db, but I'm 90% sure that you have to rebuild these manually using eitherrehashor themakecommand.
– slm♦
Aug 8 at 11:15
 |Â
show 3 more comments
up vote
1
down vote
In Sendmail you can add this user to the /etc/mail/access database file (access.db) to disallow them from sending emails:
Put their address in the file /etc/mail/access:
user@my-domain.com REJECT
Then rebuild it:
$ makemap hash /etc/mail/access.db < /etc/mail/access
NOTE: From what I remember you may have to put several permutations of their email address in this file to stop them. so things like user@localhost, etc.
I do not have a sendmail setup handy, but you can typically use a Makefile command that's provided in newer implementations of sendmail.
For more controlling the sending/receiving via Sendmail you can do more specific controls like this in this file:
To:a1@server.vikas.com REJECT # Reject a1 user from recieving mails
From:a1@server.vikas.com REJECT # Reject a1 user from sending mails
References
- How to enable/disable user's access to email (sendmail)
answered Aug 8 at 10:11
slm♦
238k65491662
Is it necessary to rebuild it? I am a little frightened to use makemap command
– it dev
Aug 8 at 10:22
I seem to remember that restarting the sendmail service did this as well. But yeah you typically have to rebuild these files in order for sendmail to use them. BTW I just reinstalled sendmail on CentOS 7 and it does still come with amakecommand, so you should be able to run that if your setup has it. If you're pensive to do this, back up the whole/etc/maildir 1st.
– slm♦
Aug 8 at 10:23
1
Good old sendmail...I prefered to deal with it editing .mc files...it would be interesting understanding the problem of the user, blocking users in sendmail wont prevent users/malware scripts form sending email/spam via TCP/25 if the infra-structure allows it.
– Rui F Ribeiro
Aug 8 at 10:48
@slm, may I only restart sendmail service after REJECTING user in access file? Will it help?
– it dev
Aug 8 at 11:13
@itdev - my suggestion was to try doing a restart after adding REJECT entry to see if it triggers a rebuild ofaccess.db, but I'm 90% sure that you have to rebuild these manually using eitherrehashor themakecommand.
– slm♦
Aug 8 at 11:15
 |Â
show 3 more comments
up vote
1
down vote
up vote
1
down vote
In Sendmail you can add this user to the /etc/mail/access database file (access.db) to disallow them from sending emails:
Put their address in the file /etc/mail/access:
user@my-domain.com REJECT
Then rebuild it:
$ makemap hash /etc/mail/access.db < /etc/mail/access
NOTE: From what I remember you may have to put several permutations of their email address in this file to stop them. so things like user@localhost, etc.
I do not have a sendmail setup handy, but you can typically use a Makefile command that's provided in newer implementations of sendmail.
For more controlling the sending/receiving via Sendmail you can do more specific controls like this in this file:
To:a1@server.vikas.com REJECT # Reject a1 user from recieving mails
From:a1@server.vikas.com REJECT # Reject a1 user from sending mails
References
- How to enable/disable user's access to email (sendmail)
answered Aug 8 at 10:11
slm♦
238k65491662
In Sendmail you can add this user to the /etc/mail/access database file (access.db) to disallow them from sending emails:
Put their address in the file /etc/mail/access:
user@my-domain.com REJECT
Then rebuild it:
$ makemap hash /etc/mail/access.db < /etc/mail/access
NOTE: From what I remember you may have to put several permutations of their email address in this file to stop them. so things like user@localhost, etc.
I do not have a sendmail setup handy, but you can typically use a Makefile command that's provided in newer implementations of sendmail.
For more controlling the sending/receiving via Sendmail you can do more specific controls like this in this file:
To:a1@server.vikas.com REJECT # Reject a1 user from recieving mails
From:a1@server.vikas.com REJECT # Reject a1 user from sending mails
References
- How to enable/disable user's access to email (sendmail)
answered Aug 8 at 10:11
slm♦
238k65491662
answered Aug 8 at 10:11
slm♦
238k65491662
answered Aug 8 at 10:11
slm♦
238k65491662
answered Aug 8 at 10:11
slm♦
238k65491662
238k65491662
Is it necessary to rebuild it? I am a little frightened to use makemap command
– it dev
Aug 8 at 10:22
I seem to remember that restarting the sendmail service did this as well. But yeah you typically have to rebuild these files in order for sendmail to use them. BTW I just reinstalled sendmail on CentOS 7 and it does still come with amakecommand, so you should be able to run that if your setup has it. If you're pensive to do this, back up the whole/etc/maildir 1st.
– slm♦
Aug 8 at 10:23
1
Good old sendmail...I prefered to deal with it editing .mc files...it would be interesting understanding the problem of the user, blocking users in sendmail wont prevent users/malware scripts form sending email/spam via TCP/25 if the infra-structure allows it.
– Rui F Ribeiro
Aug 8 at 10:48
@slm, may I only restart sendmail service after REJECTING user in access file? Will it help?
– it dev
Aug 8 at 11:13
@itdev - my suggestion was to try doing a restart after adding REJECT entry to see if it triggers a rebuild ofaccess.db, but I'm 90% sure that you have to rebuild these manually using eitherrehashor themakecommand.
– slm♦
Aug 8 at 11:15
 |Â
show 3 more comments
Is it necessary to rebuild it? I am a little frightened to use makemap command
– it dev
Aug 8 at 10:22
I seem to remember that restarting the sendmail service did this as well. But yeah you typically have to rebuild these files in order for sendmail to use them. BTW I just reinstalled sendmail on CentOS 7 and it does still come with amakecommand, so you should be able to run that if your setup has it. If you're pensive to do this, back up the whole/etc/maildir 1st.
– slm♦
Aug 8 at 10:23
1
Good old sendmail...I prefered to deal with it editing .mc files...it would be interesting understanding the problem of the user, blocking users in sendmail wont prevent users/malware scripts form sending email/spam via TCP/25 if the infra-structure allows it.
– Rui F Ribeiro
Aug 8 at 10:48
@slm, may I only restart sendmail service after REJECTING user in access file? Will it help?
– it dev
Aug 8 at 11:13
@itdev - my suggestion was to try doing a restart after adding REJECT entry to see if it triggers a rebuild ofaccess.db, but I'm 90% sure that you have to rebuild these manually using eitherrehashor themakecommand.
– slm♦
Aug 8 at 11:15
Is it necessary to rebuild it? I am a little frightened to use makemap command
– it dev
Aug 8 at 10:22
Is it necessary to rebuild it? I am a little frightened to use makemap command
– it dev
Aug 8 at 10:22
I seem to remember that restarting the sendmail service did this as well. But yeah you typically have to rebuild these files in order for sendmail to use them. BTW I just reinstalled sendmail on CentOS 7 and it does still come with a
make command, so you should be able to run that if your setup has it. If you're pensive to do this, back up the whole /etc/mail dir 1st.– slm♦
Aug 8 at 10:23
I seem to remember that restarting the sendmail service did this as well. But yeah you typically have to rebuild these files in order for sendmail to use them. BTW I just reinstalled sendmail on CentOS 7 and it does still come with a
make command, so you should be able to run that if your setup has it. If you're pensive to do this, back up the whole /etc/mail dir 1st.– slm♦
Aug 8 at 10:23
1
1
Good old sendmail...I prefered to deal with it editing .mc files...it would be interesting understanding the problem of the user, blocking users in sendmail wont prevent users/malware scripts form sending email/spam via TCP/25 if the infra-structure allows it.
– Rui F Ribeiro
Aug 8 at 10:48
Good old sendmail...I prefered to deal with it editing .mc files...it would be interesting understanding the problem of the user, blocking users in sendmail wont prevent users/malware scripts form sending email/spam via TCP/25 if the infra-structure allows it.
– Rui F Ribeiro
Aug 8 at 10:48
@slm, may I only restart sendmail service after REJECTING user in access file? Will it help?
– it dev
Aug 8 at 11:13
@slm, may I only restart sendmail service after REJECTING user in access file? Will it help?
– it dev
Aug 8 at 11:13
@itdev - my suggestion was to try doing a restart after adding REJECT entry to see if it triggers a rebuild of
access.db, but I'm 90% sure that you have to rebuild these manually using either rehash or the make command.– slm♦
Aug 8 at 11:15
@itdev - my suggestion was to try doing a restart after adding REJECT entry to see if it triggers a rebuild of
access.db, but I'm 90% sure that you have to rebuild these manually using either rehash or the make command.– slm♦
Aug 8 at 11:15
 |Â
show 3 more comments
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1
The purported duplicate question is about a Posfix system. This question is about, as it says, a Sendmail system. It is not the same answer for both.
– JdeBP
Aug 8 at 10:09
Then it is not dupe.
– peterh
Aug 8 at 19:55