postfix process defered queu only for some domains - SERP Analysis

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https://easyengine.io/tutorials/mail/postfix-queue/

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https://list.postfix.users.narkive.com/E8oC5mff/mail-stuck-in-active-queue-for-loooong-time

https://www.postfix.org/ETRN_README.html

https://bbs.archlinux.org/viewtopic.php?id=181275

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https://forums.zimbra.org/viewtopic.php?t=54246

https://manpages.ubuntu.com/manpages/trusty/man8/pipe.8postfix.html

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https://www.postfix.org/SMTPD_ACCESS_README.html

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https://forum.howtoforge.com/threads/how-to-manage-postfix-queue-so-that-ill-send-email-just-on-request.41315/

https://ma.ttias.be/postfix-mail-queue-deliver-e-mail-alternate-address/

https://www.postfix.org/ADDRESS_REWRITING_README.html

https://www.postfix.org/MULTI_INSTANCE_README.html