Nov 30, 2022
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Hello...i'm using cron at AWS,
we use cron server to deliver mail for update purpose
Notification Email sender is in cron server
Notification Email Receiver is in AWS server
For some reason,AWS reject an email from my cron server with the error as per below:

"550-The mail server does not recognize [email protected] as a valid sender"

Why suddenly AWS recognize my cron server as a invalid sender?...we not doing any changes...With invalid spf sender...we got rejected from AWS.

Full error as per below:
The original message was received at Wed, 30 Nov 2022 10:00:52 +0800 from localhost [127.0.0.1]

----- The following addresses had permanent fatal errors ----- [email protected]
(reason: 550-Verification failed for
<[email protected]-southeast-11.compute.internal>)
(expanded from: <[email protected]-southeast-11.compute.internal>)

----- Transcript of session follows ----- ... while talking to
[email protected]:
>>> DATA
<<< 550-Verification failed for
<[email protected]-southeast-11.compute.internal>
<<< 550-The mail server does not recognize [email protected]-southeast-11.compute.internal as a valid sender.
<<< 550 Sender verify failed
550 5.1.1 [email protected]... User unknown <<< 503-All RCPT commands were rejected with this error:
<<< 503-Sender verify failed
<<< 503 Valid RCPT command must precede DATA

Please advice
 
Last edited by a moderator:

cPanelWilliam

Administrator
Staff member
Mar 13, 2018
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Hello! It appears the email from your cron server is being rejected because the [email protected] email isn't recognized as a valid email account on the cron server.

Can you try whitelisting the cron server from within WHM on the AWS server to see if this allows the emails to be received? We have an article below that contains the steps to whitelist the cron server from Sender Verify checks:

How to whitelist incoming Sender Verify checks
 
Nov 30, 2022
6
2
3
Malaysia
cPanel Access Level
Root Administrator
Hello! It appears the email from your cron server is being rejected because the [email protected] email isn't recognized as a valid email account on the cron server.

Can you try whitelisting the cron server from within WHM on the AWS server to see if this allows the emails to be received? We have an article below that contains the steps to whitelist the cron server from Sender Verify checks:

How to whitelist incoming Sender Verify checks
Hello...thanks for reply...
May i know what is the meaning of "whitelisting the cron server from within WHM on the AWS server"
Could you please decribe more?Please advice...
thanks
 

cPanelWilliam

Administrator
Staff member
Mar 13, 2018
169
28
153
Houston
cPanel Access Level
Root Administrator
Hi,

May i know what is the meaning of "whitelisting the cron server from within WHM on the AWS server"
Could you please decribe more?Please advice...
The steps from the article in my last reply would allow you to whitelist emails sent from your cron server to your AWS server. This should prevent the sender verification errors you're receiving. Let us know if you're still seeing issues after applying this change. Thanks!