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Dears,
I receive successful message from postfix/pip in Centos7 (delivered via spamassassin service) while it doesn't deliver email to user with sendmail Authentication warning log. you can find log in the bellow.

mail postfix/pipe[33055]: 586D85F1EE: to=<root@servername.com>, relay=spamassassin, delay=103, delays=0.06/0.02/0/103, dsn=2.0.0, status=sent (delivered via spamassassin service)
mail postfix/qmgr[1778]: 586D85F1EE: removed
mail postfix/smtpd[46730]: disconnect from unknown[127.0.0.1]
mail sendmail[46763]: w617bxpb046763: Authentication-Warning: servername.com: spamfilter set sender to MAILER-DAEMON using -f
mail sendmail[46763]: w617bxpb046763: from=MAILER-DAEMON, size=15920, class=0, nrcpts=1, msgid=<201807010715.w617Fcg4089763@servername.com>, relay=spamfilter@localhost
mail sendmail[46763]: w617bxpb046763: SYSERR(spamfilter): Too many hops 27 (25 max): from MAILER-DAEMON via localhost, to root@servername.com
mail sendmail[46763]: w617bxpb046763: w617bxpc046763: DSN: Too many hops 27 (25 max): from MAILER-DAEMON via localhost, to root@servername.com
mail postfix/smtpd[53780]: connect from unknown[127.0.0.1]
mail postfix/smtpd[53780]: Anonymous TLS connection established from unknown[127.0.0.1]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
mail sendmail[46763]: STARTTLS=client, relay=[127.0.0.1], version=TLSv1/SSLv3, verify=FAIL, cipher=ECDHE-RSA-AES256-GCM-SHA384, bits=256/256
mail postfix/smtpd[53780]: NOQUEUE: reject: RCPT from unknown[127.0.0.1]: 550 5.1.1 <MAILER-DAEMON@servername.com>: Recipient address rejected: User unknown in virtual mailbox table; from=<> to=<MAILER-DAEMON@servername.com> proto=ESMTP helo=<servername.com>
mail sendmail[46763]: w617bxpc046763: to=MAILER-DAEMON, delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=46944, relay=[127.0.0.1] [127.0.0.1], dsn=5.1.1, stat=User unknown
mail sendmail[46763]: w617bxpc046763: w617bxpd046763: return to sender: User unknown
mail postfix/smtpd[53780]: NOQUEUE: reject: RCPT from unknown[127.0.0.1]: 550 5.1.1 <postmaster@servername.com>: Recipient address rejected: User unknown in virtual mailbox table; from=<> to=<postmaster@servername.com> proto=ESMTP helo=<servername.com>
mail sendmail[46763]: w617bxpd046763: to=postmaster, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=47968, relay=[127.0.0.1] [127.0.0.1], dsn=5.1.1, stat=User unknown
mail sendmail[46763]: w617bxpc046763: Losing ./qfw617bxpc046763: save    mail panic
mail sendmail[46763]: w617bxpc046763: SYSERR(spamfilter): savemail: cannot save rejected e    mail anywhere
mail postfix/smtpd[53780]: disconnect from unknown[127.0.0.1]
mail postfix/pipe[33055]: 8C1105F1EF: to=<root@servername.com>, relay=spamassassin, delay=104, delays=0.3/0.03/0/103, dsn=5.3.0, status=bounced (service unavailable)
mail postfix/qmgr[1778]: 8C1105F1EF: removed

What is the Authentication-Warning? and why it said Recipient address rejected: User unknown in virtual mailbox table?

Update

I add users to sendmail.mc file but it doesn't fix the issue. there is also SASL LOGIN authentication failed: Invalid authentication mechanism in log? what does it mean and where can I fix authentication mechanism.

mail postfix/smtpd[4579]: connect from unknown[178.141.251.45]
mail postfix/smtpd[4579]: warning: unknown[178.141.251.45]: SASL LOGIN authentication failed: Invalid authentication mechanism
mail postfix/smtpd[4579]: disconnect from unknown[178.141.251.45]
mail sendmail[4593]: w635Z73D004593: Authentication-Warning: servername.com: spamfilter set sender to MAILER-DAEMON using -f
mail sendmail[4593]: w635Z73D004593: from=MAILER-DAEMON, size=15920, class=0, nrcpts=1, msgid=<201807030512.w635CkWe044938@servername.com>, relay=spamfilter@localhost
mail sendmail[4593]: w635Z73D004593: SYSERR(spamfilter): Too many hops 27 (25 max): from MAILER-DAEMON via localhost, to root@servername.com
mail sendmail[4593]: w635Z73D004593: w635Z73E004593: DSN: Too many hops 27 (25 max): from MAILER-DAEMON via localhost, to root@servername.com
mail postfix/smtpd[4579]: connect from unknown[127.0.0.1]
mail postfix/smtpd[4579]: Anonymous TLS connection established from unknown[127.0.0.1]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
mail sendmail[4593]: STARTTLS=client, relay=[127.0.0.1], version=TLSv1/SSLv3, verify=FAIL, cipher=ECDHE-RSA-AES256-GCM-SHA384, bits=256/256
mail postfix/smtpd[4579]: NOQUEUE: reject: RCPT from unknown[127.0.0.1]: 550 5.1.1 <MAILER-DAEMON@servername.com>: Recipient address rejected: User unknown in virtual mailbox table; from=<> to=<MAILER-DAEMON@winwinmarke$    mail sendmail[4593]: w635Z73E004593: to=MAILER-DAEMON, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=46944, relay=[127.0.0.1] [127.0.0.1], dsn=5.1.1, stat=User unknown
mail sendmail[4593]: w635Z73E004593: w635Z73F004593: return to sender: User unknown
mail postfix/smtpd[4579]: NOQUEUE: reject: RCPT from unknown[127.0.0.1]: 550 5.1.1 <postmaster@servername.com>: Recipient address rejected: User unknown in virtual mailbox table; from=<> to=<postmaster@servername.com> $    mail sendmail[4593]: w635Z73F004593: to=postmaster, delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=47968, relay=[127.0.0.1] [127.0.0.1], dsn=5.1.1, stat=User unknown
mail sendmail[4593]: w635Z73E004593: Losing ./qfw635Z73E004593: save    mail panic
mail sendmail[4593]: w635Z73E004593: SYSERR(spamfilter): savemail: cannot save rejected e    mail anywhere
mail postfix/smtpd[4579]: disconnect from unknown[127.0.0.1]
mail postfix/pipe[4591]: BBCB623331: to=<root@servername.com>, relay=spamassassin, delay=104, delays=0.05/0.02/0/103, dsn=5.3.0, status=bounced (service unavailable)
mail postfix/qmgr[69009]: BBCB623331: removed
mail postfix/smtpd[18405]: connect from unknown[161.132.201.90]
mail postfix/smtpd[18405]: warning: unknown[161.132.201.90]: SASL LOGIN authentication failed: Invalid authentication mechanism
mail postfix/smtpd[18405]: disconnect from unknown[161.132.201.90]
mail postfix/smtpd[29270]: connect from unknown[94.16.117.217]
mail postfix/smtpd[29270]: warning: unknown[94.16.117.217]: SASL LOGIN authentication failed: Invalid authentication mechanism
mail postfix/smtpd[29270]: disconnect from unknown[94.16.117.217]
mail postfix/anvil[39360]: statistics: max connection rate 1/60s for (smtp:178.141.251.45) at Jul  3 05:33:37
mail postfix/anvil[39360]: statistics: max connection count 1 for (smtp:178.141.251.45) at Jul  3 05:33:37
mail postfix/anvil[39360]: statistics: max cache size 1 at Jul  3 05:33:37
mail postfix/smtpd[43131]: connect from unknown[46.244.212.248]
mail postfix/smtpd[43131]: warning: unknown[46.244.212.248]: SASL LOGIN authentication failed: Invalid authentication mechanism
mail postfix/smtpd[43131]: disconnect from unknown[46.244.212.248]
Faeze Ghorbannezhad
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2 Answers2

1

The Authentication-Warning message logs the fact that a mail message was submitted by user spamfilter but the user set (you could also say: forged) the sender address MAILER-DAEMON. It is really just a warning and does not prevent delivery of the message.

The message User unknown in virtual mailbox table tells you that your Postfix installation does not know the mail addresses MAILER-DAEMON@servername.com (in the first instance) and postmaster@servername.com (in the second one). The reason may be simply that you forgot to add the usual definitions for these in your aliases file.

Tilman Schmidt
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1

Authentication-Warning: servername.com: spamfilter set sender to MAILER-DAEMON using -f

In addition to what Tilman Schmidt explained you resolve that by adding the system user from the error message, spamfilter in this case, to the list of sendmail trusted users.

In your sendmail.mc either define trusted users directly with:

define(`confTRUSTED_USERS',`root daemon spamfilter')

or set:

FEATURE(`use_ct_file')
define(`confCT_FILE', `/etc/mail/trusted-users')

And add the trusted users such as spamfilter to either the default /etc/mail/trusted-users configuration file a custom location.

HBruijn
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