PHP mail() from email and replyto adds server address
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How do you make sure email you send programmatically is not automatically marked as spam?
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PHP : send mail in localhost
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How to validate an email address in PHP
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Email subscription to a combination of tags (using AND operator)
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How can I filter incoming email based on plus addressing in Gmail?
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How to send HTML-formatted email?
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PHP mail: All emails are received in the SPAM folder
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Why shouldn't I use PHP's mail() function?
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Send from Gmail with another email address as the Reply-to or From address
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How to make my server email me when there are security updates?
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How to prevent an email from accidentally being forwarded?
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Unidentified address in Gmail
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Mail-inbox shows a mail sent from its own mail-address without having sent it
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Gmail does not accept mail from a new server
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PHPMailer - gmail smtp not working properly
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When an email is forwarded, does it lose its original headers?
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Respond from the correct email