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Roundcube SMTP 451 temporary lookup failure
#1
[Not Solved] Roundcube SMTP 451 temporary lookup failure
Hello guys, i have fresh install of sentora.
I configured all settings as on my old server. But when i login to roundcube and try to send email, the windows is saying Error SMTP (451): Cant add recepient "test@stacknet.eu" (4.3.0 <test@stacknet.eu>: Temporary lookup failure)

I dont know where is problem. Passwords to mysql is OK, connection to SMTP server looks ok....

I tried to connect to SMPT server via putty (telnet 25) and when i want manualy send email via console, the server is saying some error.

I think probably DNS? Routes? What do you think?
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#2
[Not Solved] RE: Roundcube SMTP 451 temporary lookup failure
According to intoDNS, you do not have MX records for the domain: https://intodns.com/stacknet.eu
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#3
[Not Solved] RE: Roundcube SMTP 451 temporary lookup failure
I dont know how is it possible, im using cloudflare and there is two mx records configured.. i modified it and try to wait for update...

BUT: even i technicaly dont have configured mx records for my domain, i must be able to send email to gmail or to other server right?

MX records is for incoming mails right?
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#4
[Not Solved] RE: Roundcube SMTP 451 temporary lookup failure
Yes, MX if for incoming mail.

Your post on serverfault needs to be edited! It is showing your roundcube DB password!! Along with some other information that should remain hidden!
-TGates - Head of Support

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#5
[Not Solved] RE: Roundcube SMTP 451 temporary lookup failure
Thank for you for your attention. But it does not matter, after I fix this issue i will reinstall the whole server. First i must understand what is making this error, because this is clean instalation too...

As you writed MX is for incoming mails: I have problem with both, when i try to send email from gmail to my server the server responds in mail
451 4.3.0 <jakub@stacknet.eu>: Temporary lookup failure

When i try to send email from my server to gmail or somewhere else the roundcube cant send because is saying some error.
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#6
[Not Solved] RE: Roundcube SMTP 451 temporary lookup failure
I'm not sure how Cloudflare works.. I use an SMTP relayer to send mail (mailjet.com) and my own DNS in Sentora.
Me.B may be able to help you with that.
-TGates - Head of Support

SEARCH the Forums or read the DOCUMENTATION before posting!
Modules Maintained: 13 - Module Installs: 108k+

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#7
[Not Solved] RE: Roundcube SMTP 451 temporary lookup failure
https://intodns.com/stacknet.eu

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.

Example
MX point to mail.stacknet.eu
and mail.stacknet.eu A record type and resolves to server ip.

M B
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