Server blocking the sending of emails. por 25/587

Posted February 12, 2019 2.8k views

Dear Family,

We configure:

Ubuntu 14.04
Vesta panel

We are receiving emails normally.

Server blocking the sending of emails.

Digital Ocean blocks port 25 and is causing the cancellation of our emails.

We have verified and confirmed that port 587 is open and configured for shipment.

Digital Ocean is not helping in pointing out the error, unfortunately it answers the tickets with contempt.

Error message in the email:
 retry time not reached for any host after a long failure period

We performed Check list!

1st Iptables Firewall
ports 25,465,587,2525 accept - ok

2 /etc/exim4/exim4.conf.template - OK
daemonsmtpports = 25: 465: 587: 2525
tlsonconnect_ports = 465

3rd ssh #nmap localhost Iptables
25 / tcp open smtp
53 / tcp open domain
110 / tcp open pop3
143 / tcp open imap
465 / tcp open smtps
587 / tcp open submission

4th DNS digital panel ocean - OK

5º We sent yahoo emails to our accound email and the error was:
550: 5.1.1 The email account that you tried to reach does not exist.

Some foreign aid because Digital Ocean shows no solution.

We have not erased our server yet since google is scoring 97/100.

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1 answer

There are several IP blocklists, especially yahoo is picky. You might want to check that your IP is not in those blocklists.