Why do messages bounce?

There are many reasons why an email may bounce. Explanations for bounced messages can vary in format, depending on the mail server that’s sending the message back. Different types of mail servers use different terminology. Common causes for bounced messages include: address errors, bad domain names, unknown users, closed email accounts, full mailboxes and dormant accounts.

What are the different bounce types?

BOUNCE TYPE DESCRIPTION ACTION
Generic Hard

A generic hard bounce is an email that has been bounced back to the sender and is permanently undeliverable. The returning server does not provide a specific reason for the failure, but causes can include spam blocking, invalid domain, invalid user etc.

 

Real Magnet does not automatically suppress hard bounces. We recommend manually suppressing recipients with a hard bounce, or setting a hard bounce suppression threshold for the account.
User Not Found User not found signifies the email account in question does not exist. This is a permanent failure and in most cases means the email is undeliverable.

 

Real Magnet automatically suppresses recipients after 2 consecutive user not found bounces.
Bad Domain Bad Domain means the domain of the email address is not valid and Real Magnet could not deliver to it.

 

Real Magnet automatically suppresses recipients after 2 bad domain bounces.
Generic Soft A generic soft bounce is an email that gets accepted at the destination mail server but is bounced before it arrives at the intended recipient’s inbox. The returning server does not provide a specific reason for the failure. Generally, this is a temporary situation and could resolve itself over time.

 

Real Magnet automatically resends the message to generic soft bounces that same night around 10:30 pm. After that no more attempts are made to resend to soft bounces, unless a Real Magnet user presses the “Resend Bounces” feature. Then Real Magnet will resend that night at 10:30 pm. You can also set a generic soft bounce suppression threshold for the account.
Mailbox Full The recipient has too much email and their server isn’t accepting any more. This is most common with web-based email services like Hotmail or Yahoo, which have limits on how much mail you can accumulate. This can also be a sign of an abandoned account. Generally, this is a temporary situation and could resolve itself over time.

 

Resend using the “Resend Bounces” feature.
Temporary Unavailable The mail server is experiencing temporary problems such as “no adequate servers”, “Connection Timed Out”, “Resources temporarily unavailable.”, or “Out of memory”. All of these typically indicate a temporary problem with a mail server and should resolve themselves over time.

 

Resend using the “Resend Bounces” feature.
Spam Spam means the receiving server has identified the message as Spam and will most likely continue to block it. Generally, the advanced bounce details (which can be turned on for your account) provide additional information as to what either the recipient or Real Magnet can do, if possible.