Hi. I setup postfix on my Ubuntu 18.0.4 by some tutorials. It sends mails to other boxes(like my email on gmail). I already get certificate and configurate tls. But I can not receive any email. Postfix is listening 25 port.
master 9680 root 13u IPv4 250327773 0t0 TCP localhost:25 (LISTEN)
master 9680 root 14u IPv6 250327774 0t0 TCP ip6-localhost:25 (LISTEN)
master 9680 root 18u IPv4 250327779 0t0 TCP localhost:587 (LISTEN)
master 9680 root 19u IPv6 250327780 0t0 TCP ip6-localhost:587 (LISTEN)
also my ufw status :
ufw status
Status: inactive
But when I scan my 25 port by scan service like this https://www.ipvoid.com/port-scan/ or from my home PC - it teels :
WARNING: TCP connect to (myipaddress : 25) failed
Can anybody help me with my problem? /var/log/mail.log tells nothing about incoming messages. Thanks!
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Hi there,
By default SMTP port 25 is blocked on all Droplets for some new accounts to prevent spam and other abuses of our platform.
To send mail on these accounts, use a dedicated email deliverability platform (such as Sendgrid and Mailgun), which are better at handling deliverability factors like IP reputation.
For more information you could check the official documentation here:
https://docs.digitalocean.com/support/why-is-smtp-blocked/
Alternatively, you could use port 465 or 587 rather than 25.
Best, Bobby