

All you have to do is set the Authentication Type to something other than “None” and fill in your username and password. SMTPit Pro and classic SMTPit 3.0 have the ability to authenticate with your mail server. This is usually in the form of authenticating or “logging in” to your mail server. Some mail servers are a little more sophisticated than this and require extra things from you to make sure that you are allowed to send email. If everything is correct, then there are some other things you can try. Make sure that you are using a From email address that is associated with the SMTP Host you are connecting to (and that everything is spelled correctly). So, the first place to check in your database is what you are using as a From email address. Another way to put it is a mail server named “” would “know” the email address but would not “know” the email address the most common use of SMTPit is to send email to someone on the internet (instead of someone on your local mail server), the To email address is most likely not going to be “known” by your mail server. What I mean by “know”, is a mail server “knows” an email address if the email account for that email address is in that mail servers configuration files. In the most general cases, a mail server will not allow you to send email through it if it does not “know” either the To or the From email address. Your mail server has an unsolicited email (SPAM) protection scheme enabled which is giving you this error. This error is a very common error which comes from the mail server you are trying to send email through. Some email clients will ask the user if they want to send the receipt email, while others may simply ignore the header, so it is possible you may not always get the receipt email depending on the recipient. This relies on the recipient’s email client to send the receipt email. SMTPit_AddEmailHeader(“Disposition-Notification-To=‘Frank Smith’ the equals sign ( = ) is used in the calculation, but when viewed in the recipient’s email, you will see a colon ( : ).Īlso note, a return receipt may not always work. If you looked at the “full email headers” of an email that asks for a return receipt, you would see something like this:ĭisposition-Notification-To: “Frank Smith” add that email header to an email you send with SMTPit Pro, all you need to do is use the “SMTPit_AddEmailHeader” function like this: “Asking” for a return receipt (also known as a read receipt) is nothing more than adding an extra email header to your email. How can I ask for a return or read receipt?

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Why are my Apostrophes and Quotes being turned into other characters or disappear from my emails?.How can I ask for a return or read receipt?.
