Question

Server won't send email

  • Posted October 24, 2017
  • LEMP

About a month ago my SMTP block opened (by default is blocked) but I haven’t test it until today, now I just tested it but it won’t send email. I think this is my very first time I’m trying my contact form to send email to my Gmail address, but somehow on my log Google said my IP address is spammy, how so?

Here’s part of the log with credential info redacted

Oct 24 13:33:00 ubuntu-vps-name postfix/pickup[1748]: D899E43DD7: uid=1000 from=<user-account-name> Oct 24 13:33:00 ubuntu-vps-name postfix/cleanup[3280]: D899E43DD7: message-id=040b84f194a292e2e44e75aa35859d17@domain.com Oct 24 13:33:00 ubuntu-vps-name postfix/qmgr[1749]: D899E43DD7: from=user-account-name@domain.com, size=752, nrcpt=1 (queue active) Oct 24 13:33:01 ubuntu-vps-name postfix/smtp[3281]: D899E43DD7: to=my-gmail-address@gmail.com, relay=gmail-smtp-in.l.google.com[209.85.201.27]:25, delay=0.18, delays=0.03/0.01/0.06/0.09, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[209.85.201.27] said: 550-5.7.1 [server-ip-address 1] Our system has detected an unusual rate of 550-5.7.1 unsolicited mail originating from your IP address. To protect our 550-5.7.1 users from spam, mail sent from your IP address has been blocked. 550-5.7.1 Please visit 550-5.7.1 https://support.google.com/mail/?p=UnsolicitedIPError to review our 550 5.7.1 Bulk Email Senders Guidelines. g42si245975qta.275 - gsmtp (in reply to end of DATA command)) Oct 24 13:33:01 ubuntu-vps-name postfix/cleanup[3280]: 0CA5F43DD8: message-id=20171024133301.0CA5F43DD8@ubuntu-vps-name Oct 24 13:33:01 ubuntu-vps-name postfix/qmgr[1749]: 0CA5F43DD8: from=<>, size=3561, nrcpt=1 (queue active) Oct 24 13:33:01 ubuntu-vps-name postfix/bounce[3282]: D899E43DD7: sender non-delivery notification: 0CA5F43DD8 Oct 24 13:33:01 ubuntu-vps-name postfix/qmgr[1749]: D899E43DD7: removed Oct 24 13:33:01 ubuntu-vps-name postfix/local[3284]: 0CA5F43DD8: to=user-account-name@domain.com, relay=local, delay=0.02, delays=0.01/0.01/0/0, dsn=2.0.0, status=sent (delivered to mailbox) Oct 24 13:33:01 ubuntu-vps-name postfix/qmgr[1749]: 0CA5F43DD8: removed

Is this mean my server hacked? I’ve implemented all security protection from guides I found on DO guide and some other site. Please help me. Thanks

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I found an explanation here https://varaneckas.com/blog/check-your-ip/

Maybe my problem is similar with that. I knew that Digital Ocean has a lot of its IP blacklisted as spammy, I thought it’s just for website blacklist or something similar to akismet blacklist, didn’t realise that it’s also email blacklist too… I already checked my IP on some sites, none of them said my IP blacklisted. I also thought email blacklist only temporary, but it last really long from this IP previous owner until now still blacklisted.


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@MrWorldWideWeb Hey there,

These days the big mail providers like hotmail, gmail etc. have got their spamfilters pretty strict. This means you won’t be able to send any “legit” mails before you are verified. I won’t go into details alot right now, but think about configuring the following:

  • SPF
  • DKIM
  • DMARC
  • SSL/TLS
  • Global used IP Blacklists & provider specified blacklists. Hotmail for example uses reputation: https://postmaster.live.com/snds/
  • You need to be sending “proper” emails for a while before you got a good reputation.

I don’t know if you want to learn about all of that & configurate it, but I recommend doing it ;) Maybe its something completely new, but learning new things is alwasy fun!

Hope I helped you with this.