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For several months now since the update to WordPress 4.9.7 i have been experiencing issues with the WP Mail plugin showing an error on login.
EMAIL DELIVERY ERROR: WP Mail SMTP plugin logged this error during the last time it tried to send an email:
Mailer: Other SMTP
PHPMailer was able to connect to SMTP server but failed while trying to send an email.
Consider running an email test after fixing it.
Trying to send emails from the site fails, and as soon as I ran a test its successful and the error disappears. Emails then started working again. When i log out and log back in the error returns again.
This has now got much worse and the emails are now no longer sending at all. When i test sending multiple emails from the site contact page the site hangs, and the error reappears.
Please help.