By watrall
So, I’ve got Mattermost instance which works perfectly fine. Trying to set up Postfix as a send only SMTP server to handle emails (following this tutorial - https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-18-04). When I get to Step 3 - Testing the SMTP Server, things grind to a halt. For the sake of the test, I’m sending to my personal gmail account. The email bounces back with this error:
“ethan.watrall@gmail.com: host gmail-smtp-in.l.google.com[173.194.66.27] said: 550-5.7.1 [143.198.117.160 18] Our system has detected that this message is 550-5.7.1 likely suspicious due to the very low reputation of the sending IP 550-5.7.1 address. To best protect our users from spam, the message has been 550-5.7.1 blocked. Please visit 550 5.7.1 https://support.google.com/mail/answer/188131 for more information. 6si5271541qvs.171 - gsmtp (in reply to end of DATA command)”
I’ve tried sending to a couple other emails - one being my university email and one being an outlook email. I don’t even get the bounce message, the email just totally disappears.
Any help would be greatly appreciated. I’m about at the end of myrope with this.
Here’s the log:
Jun 17 22:13:51 chat postfix/pickup[2781]: 702A7BEFED: uid=1000 from=<ethan@chat.dhilab.org>
Jun 17 22:13:51 chat postfix/cleanup[5679]: 702A7BEFED: message-id=<20210617221351.702A7BEFED@chat.dhilab.org>
Jun 17 22:13:51 chat postfix/qmgr[2782]: 702A7BEFED: from=<ethan@chat.dhilab.org>, size=395, nrcpt=1 (queue active)
Jun 17 22:13:51 chat postfix/smtp[5681]: 702A7BEFED: to=<ethan.watrall@gmail.com>, relay=gmail-smtp-in.l.google.com[173.194.68.26]:25, delay=0.46, delays=0.02/0.01/0.15/0.27, dsn=5.7.1, status=bounced (host gmai$
Jun 17 22:13:51 chat postfix/cleanup[5679]: DF5ACBEFEE: message-id=<20210617221351.DF5ACBEFEE@chat.dhilab.org>
Jun 17 22:13:51 chat postfix/qmgr[2782]: DF5ACBEFEE: from=<>, size=3154, nrcpt=1 (queue active)
Jun 17 22:13:51 chat postfix/bounce[5682]: 702A7BEFED: sender non-delivery notification: DF5ACBEFEE
Jun 17 22:13:51 chat postfix/qmgr[2782]: 702A7BEFED: removed
Jun 17 22:13:51 chat postfix/local[5684]: DF5ACBEFEE: to=<ethan@chat.dhilab.org>, relay=local, delay=0.01, delays=0/0.01/0/0, dsn=2.0.0, status=sent (delivered to maildir)
Jun 17 22:13:51 chat postfix/qmgr[2782]: DF5ACBEFEE: removed
checked the log when I sent to my university address:
Jun 17 22:18:29 chat postfix/qmgr[2782]: 23DF4BEFEB: from=<ethan@chat.dhilab.org>, size=387, nrcpt=1 (queue active)
Jun 17 22:18:29 chat postfix/smtp[5699]: 23DF4BEFEB: host mxa-00165801.gslb.pphosted.com[148.163.150.35] refused to talk to me: 554 Blocked - see https://ipcheck.proofpoint.com/?ip=143.198.117.160
Jun 17 22:18:29 chat postfix/smtp[5699]: 23DF4BEFEB: to=<watrall@msu.edu>, relay=mxb-00165801.gslb.pphosted.com[148.163.153.130]:25, delay=403, delays=403/0.01/0.46/0, dsn=4.0.0, status=deferred (host mxb-001658$
Jun 17 22:22:30 chat postfix/pickup[2781]: 47EF8BEFED: uid=1000 from=<ethan@chat.dhilab.org>
Jun 17 22:22:30 chat postfix/cleanup[5707]: 47EF8BEFED: message-id=<20210617222230.47EF8BEFED@chat.dhilab.org>
Jun 17 22:22:30 chat postfix/qmgr[2782]: 47EF8BEFED: from=<ethan@chat.dhilab.org>, size=387, nrcpt=1 (queue active)
Jun 17 22:22:30 chat postfix/smtp[5709]: 47EF8BEFED: host mxb-00165801.gslb.pphosted.com[148.163.150.35] refused to talk to me: 554 Blocked - see https://ipcheck.proofpoint.com/?ip=143.198.117.160
Jun 17 22:22:30 chat postfix/smtp[5709]: 47EF8BEFED: to=<watrall@msu.edu>, relay=mxa-00165801.gslb.pphosted.com[148.163.153.130]:25, delay=0.34, delays=0.02/0.01/0.31/0, dsn=4.0.0, status=deferred (host mxa-0016$
Checked the IP at https://ipcheck.proofpoint.com, as the log suggests…and all it says is the IP is blocked.
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Hi,
@watrall wroteChecked the IP at https://ipcheck.proofpoint.com, as the log suggests…and all it says
is the IP is blocked.
spamhaus.org shows the same. It usually happens when someone reports spam incoming from a particular IP address. It might happen that your droplet inherited an IP address that has already been black-listed (blocked). If you are sure that your droplet is not sending spam, you can fix this issue by filling in the form on proofpoint.com and submitting it.
Hello, @watrall
As per Yannek’s comment, the IP address is currently blacklisted. I can see that SORBS is one of the lists:
http://www.sorbs.net/lookup.shtml?143.198.117.160
A lot of RBLs will check against SORBS and if the IP is listed there they will add the IP address in their database as well. You can make sure that all your email recipients are OPTED-IN and then request removal from SORBS.
Regards, Alex
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