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help me my server seems to be sending spam!

Cron not sending email notificationsCan't send emails from the terminalnetwork simulators to simulate a Mail server in Ubuntu 12.04Cannot receive e-mail when not logged in on ubuntu serverMy Postfix server became a spam server. How can I fix this?Postfix Mail Server. Someone is sending Mails from my serverDumping spam emails to one mailbox for processing using spamassassin and postfix on a mail relay serverBuild a local mail-serverPostfix.Dovecot/mysql mailserver setupSending email from Gmail account to local Ubuntu server

0

Running on Ubuntu 18, pretty recently installed server (started a couple of weeks ago, installation is not yet finished...). Trying to setup a simple mail server to send mail from php and host a few mail accounts for my domains.

However something is very wrong. When doing tail -f /var/log/mail.log I see LOTS of activity in there. I'm not sure all that I am seeing is actually email being sent out or if some of it is just people trying to spam through my server unsuccessfully, but anyways its writing like hundreds of entries per minute at least!

I also setup the option to have every mail sent by PHP logged in a separate log and I have maybe around 10 emails sent by PHP a day, so it seems the spam does not originate from insecure PHP scripts.

My mail.log is showing lines shuch as these:

Mar 10 21:24:26 server1 postfix/smtp[29358]: B111954079F: to=, relay=mx-eu.mail.am0.yahoodns.net[212.82.101.46]:25, delay=227210, delays=227209/0.01/0.88/0.1, dsn=4.7.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[212.82.101.46] said: 421 4.7.0 [TSS04] Messages from x.x.x.x temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command))

(x.x.x.x was my ip there)

This has been going on for days. What can be sending all those emails from (or through) my server? How? How to stop it?

Can I stop all emails not being sent by PHP somehow and just use a webmail?

Thanks!

security mail-server

share|improve this question

asked 26 mins ago

Pierre-Verthume LarivièrePierre-Verthume Larivière

1

add a comment | 

0

Running on Ubuntu 18, pretty recently installed server (started a couple of weeks ago, installation is not yet finished...). Trying to setup a simple mail server to send mail from php and host a few mail accounts for my domains.

However something is very wrong. When doing tail -f /var/log/mail.log I see LOTS of activity in there. I'm not sure all that I am seeing is actually email being sent out or if some of it is just people trying to spam through my server unsuccessfully, but anyways its writing like hundreds of entries per minute at least!

I also setup the option to have every mail sent by PHP logged in a separate log and I have maybe around 10 emails sent by PHP a day, so it seems the spam does not originate from insecure PHP scripts.

My mail.log is showing lines shuch as these:

Mar 10 21:24:26 server1 postfix/smtp[29358]: B111954079F: to=, relay=mx-eu.mail.am0.yahoodns.net[212.82.101.46]:25, delay=227210, delays=227209/0.01/0.88/0.1, dsn=4.7.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[212.82.101.46] said: 421 4.7.0 [TSS04] Messages from x.x.x.x temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command))

(x.x.x.x was my ip there)

This has been going on for days. What can be sending all those emails from (or through) my server? How? How to stop it?

Can I stop all emails not being sent by PHP somehow and just use a webmail?

Thanks!

security mail-server

share|improve this question

asked 26 mins ago

Pierre-Verthume LarivièrePierre-Verthume Larivière

1

add a comment | 

Running on Ubuntu 18, pretty recently installed server (started a couple of weeks ago, installation is not yet finished...). Trying to setup a simple mail server to send mail from php and host a few mail accounts for my domains.

However something is very wrong. When doing tail -f /var/log/mail.log I see LOTS of activity in there. I'm not sure all that I am seeing is actually email being sent out or if some of it is just people trying to spam through my server unsuccessfully, but anyways its writing like hundreds of entries per minute at least!

I also setup the option to have every mail sent by PHP logged in a separate log and I have maybe around 10 emails sent by PHP a day, so it seems the spam does not originate from insecure PHP scripts.

My mail.log is showing lines shuch as these:

Mar 10 21:24:26 server1 postfix/smtp[29358]: B111954079F: to=, relay=mx-eu.mail.am0.yahoodns.net[212.82.101.46]:25, delay=227210, delays=227209/0.01/0.88/0.1, dsn=4.7.0, status=deferred (host mx-eu.mail.am0.yahoodns.net[212.82.101.46] said: 421 4.7.0 [TSS04] Messages from x.x.x.x temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command))

(x.x.x.x was my ip there)

This has been going on for days. What can be sending all those emails from (or through) my server? How? How to stop it?

Can I stop all emails not being sent by PHP somehow and just use a webmail?

Thanks!

security mail-server

share|improve this question

asked 26 mins ago

Pierre-Verthume LarivièrePierre-Verthume Larivière

1

share|improve this question

asked 26 mins ago

Pierre-Verthume LarivièrePierre-Verthume Larivière

1

share|improve this question

asked 26 mins ago

Pierre-Verthume LarivièrePierre-Verthume Larivière

1

asked 26 mins ago

Pierre-Verthume LarivièrePierre-Verthume Larivière

1

asked 26 mins ago

Pierre-Verthume LarivièrePierre-Verthume Larivière

1