Hi all,
I'm using EASendMail ver 7.5.0.3 in VB.Net.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365#settings-for-microsoft-365-or-office-365-smtp-relay )
using Returnpath eg.
oMail.ReturnPath = sReplyTo

However when testing using invalid recipient addresses, the emails don't bounce-back to the ReturnPath address.
Is it possible to configure ReturnPath in this situation?
Cheers
John

You can use LogFileName property to generate a log file, then you can check if you used correct return path in

MAIL FROM: command.

If you have set the correct return path, you have to ask the support from the server administrator.

I suspected so. Thanks for your help Ivan

Ivan, following up from this - why is it that the logfile shows the oMail.ReturnPath in MAIL FROM and not the oMail.From address if both are specified?
Cheers

From

This property indicates the original email sender. This is what you see as the “FROM” in most mail clients.

Reply-To

This property indicates the reply address. Basically, when the user clicks “reply” in mail client, the Reply-To value should be used as the recpient address of the replied email. If you don’t set this property, the Reply address is same as From address.

Sender

This property indicates the who submit/send the email. When the user received the email, the email client displays: From: “sender address” on behalf of “from address”. If you don’t set this property, the Sender address is same as From address. Sender property is common used by mail listing provider. This property also takes effect to DKIM/DomainKeys signature, if Sender is different with From address, then you should sign DKIM/DomainKeys based on Sender domain instead of From address domain.

Return-Path

This property indicates the delivery notification report address. If you don’t set this property, the Return-Path address is same as From address. This property also takes effect to SPF record, if Return-Path is different with From address, then remote SMTP server checkes SPF record of Return-Path instead of From address.