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550 5.7.350 Remote server returned message
550 5.7.350 Remote server returned message

Bounced email.

Jelena avatar
Written by Jelena
Updated over a week ago

Like we explained in one of the articles, emails bounce all the time, and for numerous reasons.

Sometimes, it’s even harder for Office 365 users when they try to send emails to the recipients outside of Office 365, and sometimes even on Office 365, the recipient's email server (or email filtering service) will reject the email and the sender will receive the Non-Delivery Report back.

Usually, the sender will receive a Bounced Status code: 550 5.7.350.

This article will explain the reasons for this code:

  1. The message is too large

Most email service providers impose a limit on the size of messages their users can send or receive. If your message is too large for the recipient's email server, try resizing the attachments, or, even better, upload them to OneDrive and send the recipient a link.

The same goes for graphics - if your email contains a very large image or a lot of images, try resizing them.

2. The subject line is too long

Long subject lines will hurt your deliverability rate, not to mention that your recipients probably won’t even open your email if your subject line is longer than 50 characters.

If you are struggling with a subject line, maybe this blog post will help you craft the perfect one.

3. Messages suspected to be spam

This one is tricky.

There are a lot of reasons for this to happen, but there’s a solution to each problem.

Usually, this is a content-related issue. Recipients’ spam filters perceived your message as spam and rejected it.

Our recommendation is checking the information in the email that is being sent, including any links or shortened URLs which may be considered suspicious.

Make sure you don’t have too many spam words in your emails. Also, try and personalize your emails as much as possible.

Some email providers will mark emails as spam when the email to: hyperlink tag is used in email signatures.

Try sending an email in plain text and without any attachments to see if that resolves the issue.

4. Incomplete DNS record

Make sure that your domain has SPF, DKIM, and DMARC set up properly in your DNS records. Those three will go a long way to protect your domain reputation and deliverability. A domain protected with these records is less attractive to fraudsters and spammers, and is, therefore, less likely to be blacklisted by spam filters.

If you continue to experience the problem, contact the recipient by some other means (by phone, or Linkedln for example) and ask them to request that their email admin add your email address, or your domain name, to their allowed senders’ list.

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