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significantly impact deliverability. If your emails or SMS messages are frequently marked as spam or if you have high bounce rates, your reputation can suffer, leading to

your messages, delay them or send them to the spam folder. The immediate consequences are higher bounce rates and falling open rates; the knock-on effects are

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, 250 OK, which usually means the receiving server accepted the message. Message ID: a unique ID that identifies that specific email. Bounce information: useful

. This not only helps in reducing the bounce rate but also ensures that you are not repeatedly sending emails to non-interested parties, which could lead to

, and test every campaign before sending. Monitor your bounce and complaint rates: these are the first signals mailbox providers look at. Why do emails go to

that returned you as a result of a bounce, a code gives you the type of bounce. Here is the correspondence between the code and the type of bounce: The VERP

temporary problem (the MTA retries) and 5xx for a permanent one (a hard bounce). Our list of common SMTP errors decodes the usual ones. What are the components of email

treat a high bounce rate as a spam signal, so unverified lists get filtered even when the content is legitimate. Read how to keep your email list clean, see why

bounce: the receiving server is asking to try again later. The two most common... Read more How to Fix Error 553 (Mailbox Name Not Allowed) SMTP error 553