This forum uses cookies
This forum makes use of cookies to store your login information if you are registered, and your last visit if you are not. Cookies are small text documents stored on your computer; the cookies set by this forum can only be used on this website and pose no security risk. Cookies on this forum also track the specific topics you have read and when you last read them. Please confirm whether you accept or reject these cookies being set.

A cookie will be stored in your browser regardless of choice to prevent you being asked this question again. You will be able to change your cookie settings at any time using the link in the footer.

Roundcube SMTP 451 temporary lookup failure
RE: Roundcube SMTP 451 temporary lookup failure

see the red part you didn't setup any MX for that domain. So you need to setup MX entries that point to a CNAME DNS entry resolving to server IP.

MX point to
and A record type and resolves to server ip.

No support using PM (Auto adding to IGNORE list!), use the forum. 
How to ask
Freelance AWS Certified Architect & SysOps// DevOps

10$ free to start your VPS
Thanks given by:

Messages In This Thread
RE: Roundcube SMTP 451 temporary lookup failure - by Me.B - 08-31-2017, 05:02 PM

Possibly Related Threads…
Thread Author Replies Views Last Post
How to upgrade RoundCube rajeevrrs 0 1 ,880 11-01-2022, 10:19 PM
Last Post: rajeevrrs
can not send email - SMTP error on roundcube wolvepy 9 30 ,350 01-03-2020, 08:37 AM
Last Post: Telepuzik
How to add password reset option in roundcube hakunamatata 15 65 ,153 02-08-2019, 12:20 PM
Last Post: republicus

Forum Jump:

Users browsing this thread: 1 Guest(s)