I'm sorry to have to inform you that the message returned below could not be delivered to one or more destinations. You can delete your own text from the message returned below. Commonly this is caused by a mis-type of the user part of the email address the part before the " ".
Please check the email address again. Another cause of the User unknown message is that you have replied to somebody's email, but that person has mis-typed their email address in the "Reply address" section of their email program.
Therefore when you attempt to reply to their email by clicking the Reply button in your email program, you are replying to the wrong address. Host unknown Your email did not reach the host mail server. Commonly this is caused by a mis-type of the domain name part of the email address the part after the " ". Another cause of the Host unknown message is that the host mail server itself is experiencing technical problems, or there are problems on the network on which the host mail server is located.
But the user's mailbox was either full or your email was too big to fit into the mailbox. Every server has a different way of interpreting the mail headers to establish authenticity, but the more consistent the signals contained in your messages are, the better.
As phishing and spoofing attacks increase and ISPs work to protect their own reputations, even reputable emails are subject to scrutiny. Although there are a whole host of things that play into your sending reputation, cleaning up your email header and customizing your return path is an easy fix to get your emails past the gates.
SparkPost allows companies to set a custom return path so they can begin building their reputation now. This email boot camp will help you to increase the ROI of your email operations with 15 proven tactics for boosting email deliverability. Learn how third-party data shows the deliverability difference between SparkPost and also-ran cloud service providers yields hard, bottom-line benefits.
This practical course is a great way to get started understanding email deliverability and how to measure email performance. Sometimes secondary information is necessary for delivery, sometimes it isn't, so SmartyStreets will flag addresses that are missing secondary information , but it will not mark it as non-deliverable.
Endorsement Reason Notes Not Deliverable as Addressed—Unable to Forward Mail undeliverable at address given; no change-of-address order on file; forwarding order expired.
Somebody moved but didn't tell the USPS to forward their mail or the forwarding period ended. Attempted—Not Known Delivery attempted, addressee not known at place of address. This means the letter, as it was addressed, was delivered or attempted but then put back into the mail stream because the recipient didn't match the one currently at the address. Vacant House, apartment, office, or building not occupied.
Addresses marked as "Vacant" reached the destination terminal but were then returned as undeliverable because the mail carrier marked the address as vacant.
However, when you know why mail is returned, it can help you take steps to avoid wasting money in your future direct mail marketing campaigns. Here are the top five reasons why your mail is returned:. Mail is Refused Sometimes a person will refuse to accept the mail when they receive something. Return to Sender Mail can be returned to the sender for several reasons.
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