SMTP Error (451): Failed to add recipient

Operating System & Version
Centos 7
cPanel & WHM Version
94.0.5

Vs Nu

Well-Known Member
Jul 17, 2015
119
7
68
India
cPanel Access Level
Root Administrator
I had installed the cPanel on the Dedicated Machine using with Trial license

After installing i have any done any changes on Exim configuration..After adding the domain and DNS Pointed

I'm unable to send the Email from webmail (Roundcube)

It gives error

SMTP Error (451): Failed to add recipient "[email protected]" please try again later

How to fix this issue ?

Is there any bug on the cpanel release 94.0.5
 
Last edited by a moderator:

cPRex

Jurassic Moderator
Staff member
Oct 19, 2014
5,425
696
313
cPanel Access Level
Root Administrator
Hey there! Can you make sure that outgoing messages are not suspended on that account for some reason? Details on that can be found here:

 

Vs Nu

Well-Known Member
Jul 17, 2015
119
7
68
India
cPanel Access Level
Root Administrator
It got solved by doing an Force cPanel update

Now in outlook I'm getting the following bounce back

'[email protected]' on 27-04-2021 10.12 PM

503 Valid RCPT command must precede DATA

But I can able to send mail from webmail (Roundcube)