maybe something like this will work - 1) add a REPLY_TO address to each email sent, for eg - [email protected] 2) foward all mails received at [email protected] to [email protected] 3) receive incoming mails at [email protected] and check the subject like and body for strings like Delivery failed error etc (you can try this out with some bad emails bouncing back) and hence remove the email address from your mailing list
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