Disposition-Notification-To Email Header The “Disposition-Notification-To” email header is used to request a return receipt or read receipt from the recipient’s email client. When this header is present, the recipient’s email client may send a notification back to the sender indicating that the email was received, opened, or processed in some way. How It Works: The “Disposition-Notification-To” header specifies the email […]
Is it Possible for an Email to Have Multiple “Reply-To” Addresses? Yes, it is technically possible for an email to have multiple “Reply-To” addresses. The “Reply-To” header in an email can list multiple email addresses separated by commas, similar to the “To” or “Cc” headers. This is defined by the RFC 5322 standard, which governs the Internet Message Format used […]
In the SMTP (Simple Mail Transfer Protocol) protocol, the “FROM” header field and the “MAIL FROM” command in the SMTP session serve different purposes and play distinct roles in the process of sending an email message: FROM Header Field: The “FROM” header field is part of the email message itself and is used to indicate the sender of the email. […]
The format of email is MIME. A simple MIME message consists of headers followed by a body. For example, here’s a simple text/plain email: From: sender@example.com To: recipient@example.com Subject: Example Email Content-Type: text/plain; charset=”UTF-8″ Hello, This is a simple plain text email. Regards, Sender MIME can be multipart. Here’s a text/plain email with a PDF attachment: From: sender@example.com To: recipient@example.com […]
There are a few different ways related images can be contained in the MIME of HTML email. The 1st is by Content-Location. The following MIME shows the use of Content-Location. The URL contained in the <img> tag’s “src” attribute should match the value of the Content-Location header. Content-Type: multipart/related; boundary=boundary1 –boundary1 Content-Type: text/html; charset=UTF-8 <html> <body> <p>This is an email […]
If Apple Mail displays the warning “Unable to verify message signature”, and when clicking details it says: The digital signature is incorrect. The message may have been tampered with or corrupted since signed by (sender’s name). the reason is due to a bug in Apple Mail (possibly introduced in a recent version of MacOSX). See https://apple.stackexchange.com/questions/343251/apple-mail-warning-unable-to-verify-message-signature “When Mail is set […]