The mails to the domains on Exchange get routed fine and are delivered. The mails for domain C get (in my test) relayed to outlook.com (the domain I sent my test-email from).
I make use of the relay_recipients-file and both emailaddressess are in there.
This is what I see in the logging
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Jun 6 15:40:06 efa postfix/smtpd[22519]: NOQUEUE: reject: RCPT from mail-vi1eur05olkn2096.outbound.protection.outlook.com[40.92.90.96]: 550 5.1.1 <email@domainc.com>: Recipient address rejected: undeliverable address: No user at this address; from=<email@hotmail.com> to=<email@domainc.com> proto=ESMTP helo=<EUR05-VI1-obe.outbound.protection.outlook.com>
Jun 6 15:40:06 efa postfix/smtpd[22519]: disconnect from mail-vi1eur05olkn2096.outbound.protection.outlook.com[40.92.90.96] ehlo=2 starttls=1 mail=1 rcpt=0/1 quit=1 commands=5/6
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550 5.1.1 <email@domainc.com>: Recipient address rejected: undeliverable address: No user at this address
After the update I also saw there messages (not sure if they're somehow related):
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Jun 6 15:48:01 efa MailScanner[20697]: New Batch: Scanning 1 messages, 6105 bytes
Jun 6 15:48:01 efa MailScanner[20697]: Virus and Content Scanning: Starting
Jun 6 15:48:02 efa MailScanner[20697]: Spam Checks: Starting
Jun 6 15:48:02 efa MailScanner[20697]: MailWatch: Whitelist refresh time reached
Jun 6 15:48:02 efa MailScanner[20697]: MailWatch: Starting up MailWatch SQL Whitelist
Jun 6 15:48:02 efa MailScanner[20697]: MailWatch: Read 513 whitelist entries
Jun 6 15:48:02 efa MailScanner[20697]: MailWatch: Blacklist refresh time reached
Jun 6 15:48:02 efa MailScanner[20697]: MailWatch: Starting up MailWatch SQL Blacklist
Jun 6 15:48:02 efa MailScanner[20697]: MailWatch: Read 11 blacklist entries
Jun 6 15:48:16 efa MailScanner[20697]: Unable to initialise database connection: Access denied for user 'efa'@'localhost' (using password: NO)