Hello.
I am able to receive emails fine, but I cannot send to outlook or gmail.
When I hit send in Roundcube it gets stuck in Message Queue for some time, then Mail Delivery System sends me email saying:
“Mail delivery failed: returning message to sender”
2022-04-19 16:56:04 Start queue run: pid=2210
2022-04-19 16:56:04 1ngr64-0002H2-6y Message is frozen
2022-04-19 16:57:05 1ngqXD-0003lY-1o H=outlook-com.olc.protection.outlook .com [104.47.58.33]: SMTP error from remote mail server after pipelined end of data: 451 4.7.0 Timeout waiting for client input [DM6NAM10FT053.eop-nam10.prod.protection.outlook .com]
2022-04-19 16:58:06 1ngqXD-0003lY-1o H=outlook-com.olc.protection.outlook .com [104.47.55.33]: SMTP error from remote mail server after pipelined end of data: 451 4.7.0 Timeout waiting for client input [MW2NAM10FT025.eop-nam10.prod.protection.outlook .com]
2022-04-19 16:58:06 1ngqXD-0003lY-1o == [xxxxx.x@outlook .com]R=dnslookup T=remote_smtp defer (-46) H=outlook-com.olc.protection.outlook .com [104.47.55.33]: SMTP error from remote mail server after pipelined end of data: 451 4.7.0 Timeout waiting for client input [MW2NAM10FT025.eop-nam10.prod.protection.outlook .com]
2022-04-19 16:58:06 1ngs0n-0000AB-0S Message is frozen
This is gmail logs:
2022-04-19 17:08:07 1ngqyc-0001L3-4r ** [xxxxx.x@gmail .com] R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google .com [74.125.195.27] X=TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256 CV=no: SMTP error from remote mail server after pipelined end of data: 599 EOF
EDIT: but work with yahoo mail.
I tried reinstalling Server OS.
I have 8.2/10 score in mail-tester.com
Got a new IP in the same block from my VPS Host, 100% clean on mxtoolbox. but didn’t work, same error.
Then got a new VPS (new hardware) from my VPS Host, with another new IP but in different block this time, 100% clean on mxtoolbox. but didn’t work either, same error.
Yes, I used VestaCP around 5 years (same VPS Host as now) without any problem. This issue only started few months ago, so was also trying HestiaCP.
But I think I am gonna stick to HestiaCP from now on. Previous server was running CentOS 7.6, current one is running Ubuntu 18.04 LTS.
As far as I know, there is no issue with Hostname, rDNS or DNS. But feel free to checkup. my IP and Hostname are mentioned in the screenshot from mxtoolbox below: