Some email servers are refusing emails from our list because there are two Reply To headers, one for A and one for C. Surely the list option specified should have resulted in only one Reply To header, that being for C ?
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MailEnable: Message could not be delivered to some recipients.
The following recipient(s) could not be reached:
Recipient: [SMTP:xxx@zzz.com]
Reason: 550 Messages should have one or no Reply-To headers, not 2.
Recipient: [SMTP:yyy@zzz.cm]
Reason: 550 Messages should have one or no Reply-To headers, not 2.
Brett