Sorry - hier nochmal das ganze 
Apr 23 04:07:30 ucsXXXXXX postfix/qmgr[3506]: 8418F4B0201E: from=<VeeamLinuxBackup@company.lan>, size=1611, nrcpt=1 (queue active)
Apr 23 04:07:30 ucsXXXXXX amavis[8031]: (08031-06) Passed CLEAN {RelayedInbound}, [127.0.0.1] <VeeamLinuxBackup@company.lan> -> <michael.kolowicz@company.lan>, Message-ID: <5add3fe1.2TqVxMomtc4Bwy54%VeeamLinuxBackup@company.lan>, mail_id: fxwZ9CczeV4B, Hits: -0.001, size: 921, queued_as: 8418F4B0201E, 925 ms
Apr 23 04:07:30 ucsXXXXXX postfix/smtpd[7326]: connect from localhost[127.0.0.1]
Apr 23 04:07:30 ucsXXXXXX postfix/smtpd[7326]: C43244B01F72: client=localhost[127.0.0.1], orig_client=unknown[127.0.0.1]
Apr 23 04:07:30 ucsXXXXXX postfix/cleanup[7319]: C43244B01F72: message-id=<20180423020729.B73644B013BA@ucsXXXXXX.company.lan>
Apr 23 04:07:30 ucsXXXXXX postfix/smtpd[7326]: disconnect from localhost[127.0.0.1]
Apr 23 04:07:30 ucsXXXXXX postfix/qmgr[3506]: C43244B01F72: from=<root@ucsXXXXXX.company.lan>, size=1536, nrcpt=1 (queue active)
Apr 23 04:07:30 ucsXXXXXX postfix/smtp[7321]: 808594B01FD5: to=<michael.kolowicz@company.lan>, relay=127.0.0.1[127.0.0.1]:10024, delay=1.5, delays=0.32/0.06/0.03/1.1, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 8418F4B0201E)
Apr 23 04:07:30 ucsXXXXXX postfix/qmgr[3506]: 808594B01FD5: removed
Apr 23 04:07:30 ucsXXXXXX amavis[10268]: (10268-05) Passed CLEAN {RelayedOpenRelay}, [127.0.0.1] <root@ucsXXXXXX.company.lan> -> <root@ucsXXXXXX.company.lan>, Message-ID: <20180423020729.B73644B013BA@ucsXXXXXX.company.lan>, mail_id: vfhBtYLmIUPg, Hits: 0, size: 1027, queued_as: C43244B01F72, 1066 ms
Apr 23 04:07:31 ucsXXXXXX postfix/lmtp[7327]: 8418F4B0201E: to=<michael.kolowicz@company.lan>, relay=127.0.0.1[127.0.0.1]:2003, delay=0.6, delays=0.28/0.01/0.03/0.28, dsn=5.1.1, status=bounced (host 127.0.0.1[127.0.0.1] said: 503 5.1.1 User does not exist (in reply to RCPT TO command))
Apr 23 04:07:31 ucsXXXXXX postfix/cleanup[7319]: 111AD4B0203A: message-id=<20180423020731.111AD4B0203A@ucsXXXXXX.company.lan>
Apr 23 04:07:31 ucsXXXXXX postfix/smtp[7322]: B73644B013BA: to=<root@ucsXXXXXX.company.lan>, orig_to=<root>, relay=127.0.0.1[127.0.0.1]:10024, delay=1.7, delays=0.43/0.03/0.01/1.3, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as C43244B01F72)
Apr 23 04:07:31 ucsXXXXXX postfix/qmgr[3506]: B73644B013BA: removed
Apr 23 04:07:31 ucsXXXXXX postfix/bounce[7330]: 8418F4B0201E: sender non-delivery notification: 111AD4B0203A
Apr 23 04:07:31 ucsXXXXXX postfix/qmgr[3506]: 111AD4B0203A: from=<>, size=3698, nrcpt=1 (queue active)
Apr 23 04:07:31 ucsXXXXXX postfix/qmgr[3506]: 8418F4B0201E: removed
Apr 23 04:07:31 ucsXXXXXX postfix/local[7331]: C43244B01F72: to=<systemmail@ucsXXXXXX.company.lan>, orig_to=<root@ucsXXXXXX.company.lan>, relay=local, delay=0.45, delays=0.15/0.04/0/0.26, dsn=5.2.2, status=bounced (cannot update mailbox /var/mail/systemmail for user systemmail. error writing message: File too large)
Apr 23 04:07:31 ucsXXXXXX postfix/cleanup[7319]: 3D0294B0201E: message-id=<20180423020731.3D0294B0201E@ucsXXXXXX.company.lan>
Apr 23 04:07:31 ucsXXXXXX postfix/lmtp[7327]: 111AD4B0203A: to=<VeeamLinuxBackup@company.lan>, relay=127.0.0.1[127.0.0.1]:2003, delay=0.25, delays=0.12/0/0.03/0.09, dsn=5.1.1, status=bounced (host 127.0.0.1[127.0.0.1] said: 503 5.1.1 User does not exist (in reply to RCPT TO command))
Apr 23 04:07:31 ucsXXXXXX postfix/qmgr[3506]: 111AD4B0203A: removed
Apr 23 04:07:31 ucsXXXXXX postfix/bounce[7330]: C43244B01F72: sender non-delivery notification: 3D0294B0201E
Apr 23 04:07:31 ucsXXXXXX postfix/qmgr[3506]: 3D0294B0201E: from=<>, size=3624, nrcpt=1 (queue active)
Apr 23 04:07:31 ucsXXXXXX postfix/qmgr[3506]: C43244B01F72: removed
Apr 23 04:07:31 ucsXXXXXX postfix/local[7331]: 3D0294B0201E: to=<systemmail@ucsXXXXXX.company.lan>, orig_to=<root@ucsXXXXXX.company.lan>, relay=local, delay=0.2, delays=0.09/0/0/0.11, dsn=5.2.2, status=bounced (cannot update mailbox /var/mail/systemmail for user systemmail. error writing message: File too large)
Apr 23 04:07:31 ucsXXXXXX postfix/qmgr[3506]: 3D0294B0201E: removed