I’ve try exim and postfix. Both log connectinon timeout and network unreachable error. ul 28 10:56:18 ht-by-sakurami postfix/cleanup: E10372F524F: message-id=20210728105618.E10372F524F@domain.com Jul 28 10:56:18 ht-by-sakurami postfix/qmgr: E10372F524F: firstname.lastname@example.org, size=344, nrcpt=1 (queue active) Jul 28 10:56:02 ht-by-sakurami postfix/smtp: connect to gmail-smtp-in.l.google.com[220.127.116.11]:25: Connection timed out Jul 28 10:56:02 ht-by-sakurami postfix/smtp: connect to gmail-smtp-in.l.google.com[2a00:1450:4013:c16::1a]:25: Network is unreachable Jul 28 10:56:02 ht-by-sakurami postfix/smtp: connect to alt1.gmail-smtp-in.l.google.com[2a00:1450:4010:c1c::1a]:25: Network is unreachable
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It looks like that you are using port 25. Note that 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.
I would advise using port 465 or 587 instead.