Add a Plain-Text Version to HTML Emails
Generates a plain-text alternative for HTML emails that do not include one, which spam filters like and text-only email clients need.
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Admin Notice When an Email Fails to Send
Shows administrators a warning in the dashboard when WordPress could not send an email, with the error message, so delivery problems are noticed quickly.
Clean Up Email Recipient Lists Before Sending
Removes duplicate, malformed and placeholder addresses (such as example.com or .test domains) from email recipient lists, so one bad address does not make the whole email fail.
Keep the From Address on Your Own Domain
When a plugin sends email "from" a visitor's or a free webmail address, switches the From to your own domain and keeps the original address as Reply-To, so emails pass SPF and DMARC checks.
Match the Return-Path to the From Address
Sets the envelope sender (Return-Path) of outgoing emails to the From address, which improves SPF alignment and deliverability on many hosts.
Never Email Certain Addresses or Domains
Removes addresses and whole domains on your suppression list from every outgoing email, such as bouncing inboxes or people who asked not to be contacted, and skips emails left with no recipient.
Send Contact Form 7 Emails From Your Own Domain
When a Contact Form 7 form is set to send "from" the visitor's address, switches the sender to your own domain and moves the visitor's address to Reply-To, so emails stop landing in spam.
Send Email Through SMTP
Routes all WordPress email through an SMTP server, using credentials stored as constants in wp-config.php rather than in the database.
Send Gravity Forms Notifications From Your Own Domain
When a Gravity Forms notification uses the visitor's email or another outside domain as the From address, switches it to your domain and keeps that address as Reply-To.
Send a Test Email From the Admin
Adds a Tools > Send Test Email screen where administrators can send a test message to any address and see right away whether WordPress could hand it off.
Sign Outgoing Emails With DKIM
Adds a DKIM signature to every email using a private key file and settings stored in wp-config.php, so receiving servers can verify your messages.
Skip Oversized Email Attachments
Removes attachments that would make an email larger than your mail server accepts and notes it in the message, so the email still arrives instead of bouncing.