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https://serverfault.com/questions/626249/delivery-temporarily-suspended-host-or-domain-name-not-found
Disable spontaneous SMTP mail delivery (if using on-demand dialup IP only). With below parameter, postfix won't attempt to send email unless you run postqueue -f manually. Place this parameter in main.cf. More info in here. defer_transports = smtp # (Only for on-demand dialup IP hosts) Disable SMTP client DNS lookups (dialup LAN only).
https://www.howtoforge.com/community/threads/sending-mails-to-remote-domains-is-not-working.229/
Feb 20, 2006 · [SOLVED] Sending mails to remote domains is not working. Hi All, I reinstalled my system again. Followed Falko's instruction close to every single letter. I now have a kind of working system with ISP Config as well. My problem now is as follows: I can send emails to the domains I've created in ISP Config example.com and example1.com
https://community.spiceworks.com/topic/444039-mail-delivery-problem-type-mx-host-not-found
Feb 13, 2014 · It looks to me like there's a DNS problem at my client's email host, but I need confirmation, please, or tell me I'm wrong. The bounce message says: This is the mail system at host gateway12.somedomain.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
https://forums.zimbra.org/viewtopic.php?t=58717
I migrated my Zimbra-Server (single server configuration, ZCS 8.6.0 on Ubuntu 14.04) to an new host with a new ip address. I used the rsync-way described in …
https://support.plesk.com/hc/en-us/articles/115001016814-Outgoing-mail-does-not-work-local-data-error-while-talking-to-smtp-mailexample-com
Nov 06, 2018 · Such relayhost is not accessible: # telnet relay.example.tld 25 Trying 203.0.113.2... telnet: connect to address 203.0.113.2: Connection timed out. Cause. Postfix misconfiguration. Manually configured relayhost is not accessible from the server. Resolution. Login to the server via SSH. Open /etc/postfix/main.cf with any text editor, e.g.:
https://ja.stackoverflow.com/questions/20055/postfix%E3%81%AEsendmail%E3%82%B3%E3%83%9E%E3%83%B3%E3%83%89%E3%81%A7%E3%83%A1%E3%83%BC%E3%83%AB%E9%80%81%E4%BF%A1%E3%81%A7%E3%81%8D%E3%81%AA%E3%81%84
Postfix は、デフォルトでは自身で宛先ドメインの MX を DNS で検索しようとするので、該当する MX RR が索けない場合は提示されているログのように MX: Host not found になり一時エラー、最終的にはバウンスします。
https://forums.zimbra.org/viewtopic.php?t=25421
Sep 13, 2014 · [SOLVED] Zimbra server not delivering mail Post by Skidmark » Wed Nov 18, 2009 7:44 pm From checking /var/log/maillog, it seems that the server doesn't seem to recognize its own hostname anymore.
https://answers.microsoft.com/en-us/outlook_com/forum/all/emails-to-protectionoutlookcom-getting-deferred/165ebcb1-7835-474e-adee-e7327064c618
Mar 13, 2020 · I have a number of emails outbound to office 365 users (namely xx.xx.protection.outlook.com) that are coming back as deferred for example: Deferred: delivery temporarily suspended: Host or domain name
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