Hello<\/p>\n
I am having this same problem described below but in a multi-site setup:
\nhttps:\/\/wordpress.org\/support\/topic\/message-id-nor-valid\/<\/p>\n
In my scenario I have multiple sites, each with own domain, but they all use a common mail domain, which is different from the site domain. <\/p>\n
Your previously proposed solution calls to hack \/Postman\/PostmanWpMail.php which is not very elegant or stable in case a future plugin update would change the file back to its original form.<\/p>\n
Could you please add the domain part of the message id as a configurable parameter? If empty your default behavior according to line 87 in PostmanWpMail.php would take effect, but if the domain parameter in the plugin setup is filled with a value, it would take that.<\/p>\n
Could you please make this change?<\/p>\n
Otherwise, many thanks for a great plugin.<\/p>\n
Best regards<\/p>\n","protected":false},"template":"","class_list":["post-13037637","topic","type-topic","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/13037637","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic"}],"about":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/topic\/13037637\/revisions"}],"wp:attachment":[{"href":"https:\/\/wordpress.org\/support\/wp-json\/wp\/v2\/media?parent=13037637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}