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Hi,
I updated Plesk Obsidian to Version 18.0.45 yesterday and ever since any of my domains that use either Swiftmailer or the more up-to-date Symofny Mailer no longer work correctly and are unable to send out emails via sendmail (the default transport, "sendmail://default" in symfony mailer)...
I updated to Plesk 18.0.45 yesterday and I appear to be getting the same/similar error using sendmail -bs again. The issue doesn't appear with sendmail -t.
Expected response code 220 but got code "", with message "Unable to init new groups for user 'postfix': Operation not permitted
System error...
Had the same issue this morning after the update, hope the -bs option gets restored as it will have a massive knock-on effect to anyone using Swiftmailer or Symfony Mailer with sendmail... The joys of having to go through and update my code temporarily to -t version on over 100 client websites...