System generated emails getting rejected by ESP due to sender verification callout

andryangouw

Member
Jun 26, 2010
14
2
51
Hi,

I use SpamExperts (an ESP) to relay some of my cPanel's outgoing emails and I noticed system-generated emails coming from [email protected] are being rejected by SpamExperts due to their Sender Verification Callout (SVC). While I'm asking SpamExperts if I can disable SVC on their side, I'm wondering if there is a way to let Exim whitelist some system-related email users (to let remote SMTPs know the email exists to bypass SVC).

Cheers,
Andryan
 

cPanelLauren

Product Owner
Staff member
Nov 14, 2017
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Houston
Hello @andryangouw

I don't believe there is a way to respond that an email address exists when it doesn't, ultimately you should be able to whitelist these email addresses with Spam Experts if they're rejecting them.

Thanks!
 

andryangouw

Member
Jun 26, 2010
14
2
51
Hi Lauren,

Thanks for your reply.

SpamExperts do not have an option to do this on their Hosted Cloud, unfortunately.

I can think of 2 ways but they are not elegant workarounds. First is to enable catch-all email account on the server hostname which would solve the SVC that SpamExperts. Second would be to create the non-existent systems account on the server hostname.

How do I achieve #1 and #2 for the server hostname since it's not really a "cPanel account"?
 

cPanelLauren

Product Owner
Staff member
Nov 14, 2017
13,296
1,271
313
Houston
Hi @andryangouw

First is to enable catch-all email account on the server hostname which would solve the SVC that SpamExperts. Second would be to create the non-existent systems account on the server hostname.
Well, a Catch-all would be for receiving mail it won't make the email account report as existing for outbound mail though. So if something is sent from an email address that doesn't exist to SpamExperts I do believe they'll reject it rather than send it outbound.

Creating an email account of the hostname of the server could cause issues with the hostname and it's not a recommended configuration.

Based on their troubleshooting tips SpamExperts — Helpful Troubleshooting Tips it appears that they do have a whitelist feature. They should also be able to release any messages that were erroneously blocked.


Thanks!
 

andryangouw

Member
Jun 26, 2010
14
2
51
Hi @andryangouw


Well, a Catch-all would be for receiving mail it won't make the email account report as existing for outbound mail though. So if something is sent from an email address that doesn't exist to SpamExperts I do believe they'll reject it rather than send it outbound.

Creating an email account of the hostname of the server could cause issues with the hostname and it's not a recommended configuration.

Based on their troubleshooting tips SpamExperts — Helpful Troubleshooting Tips it appears that they do have a whitelist feature. They should also be able to release any messages that were erroneously blocked.


Thanks!
I thought if catchall is set, it would cause the SVC done by SpamExperts servers to pass because during the callout an RCPT TO the non-existent FROM email address would be accepted?