79449917

Date: 2025-02-19 00:31:21
Score: 0.5
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I'm not sure this will fix things but have you just tried to send the GroupID by itself?

mailMessage.SetAsm(unsubscribeGrpId)

Also, I've noticed if you don't have a valid group ID (which you find in the SendGrid Web Dashboard -> Suppressions -> Unsubscribe Groups), it will not give you an error but the email will not be sent.

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Posted by: Mike Smith