1st
Try running the following commands under sudo / root, replaceing [accountname] with the cpanel account name of the user. Then try send an email or retry sending an email in the queue.
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whmapi1 unsuspend_outgoing_email user=[accountname]
whmapi1 release_outgoing_email user=[accountname]
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2nd
The above worked for a couple accounts, but for one this did not work. There is 3 files depending on the type of block. Have a look in the following files below and remove the accountname / email address if present.
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/etc/outgoing_mail_hold_users
/etc/outgoing_mail_suspended_users
/etc/email_send_limits
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I found my user within “/etc/outgoing_mail_suspended_users” and once removed, everything went back to normal.