In ubuntu, I'm using postfix and dovecot to deliver email from my server.
I've set DKIM, SPF and all other stuff. I have my email tested from https://www.mail-tester.com and got 10/10 point.
When I'm sendin an e-mail to
- Gmail - it is sent and the result is like the following:
email@example.com, relay=gmail-smtp-in.l.google.com[184.108.40.206]:25, delay=0.5, delays=0.08/0.01/0.15/0.27, dsn=2.0.0, status=sent (250 2.0.0 OK
- Outlook - it is not sent and the result is like the following:
firstname.lastname@example.org, relay=eur.olc.protection.outlook.com[220.127.116.11]:25, delay=0.14, delays=0.07/0/0.06/0.02, dsn=5.7.1, status=bounced (host eur.olc.protection.outlook.com
lost connection with eur.olc.protection.outlook.com[18.104.22.168] while sending RCPT TO
What possible problem could it be that it can't deliver Outlook while it can deliver to Gmail?
I'll be appriciated for your answers.
(If you need any further information to understand the problem please let me know in the comments.. Thank you)