Thanks for sharing this workaround it’s really helpful! Replacing imap_ping()
with is_resource($this->imapStream)
on line 394 in Mailbox.php
solved the “IMAP\Connection is already closed” error for me as well on Mautic 6.0.4.
For more context, you can also check this related discussion: Mauticfetch command not working – Mautic 6.0.2.
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