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Why are my Emails Getting Failed with the "SMTP Data Not Accepted" Error?"
Why are my Emails Getting Failed with the "SMTP Data Not Accepted" Error?"
Naitik Chavda avatar
Written by Naitik Chavda
Updated over a week ago

Sometimes, you may notice that emails that you try to send through SalesHandy fail for a reason: "SMTP: data not accepted". Below are the possible reasons behind why it happens.

If your server doesn't allow different senders and usernames.

Some servers require that the From email address is the same as the email address used to authenticate. Check the from name and match it to the username you use to log in to your SMTP server.

The file size of your message might be too large.

Some servers reject a message if the body is too large. HTML emails, in general, are bigger than normal text messages, but it's recommended to decrease the size by removing some content or by disabling embedded images.

SalesHandy's IPs are blacklisted by your email service provider.

We don't send your emails using our servers, but we initiate the emails from our servers, and those email requests are sent to your email provider's servers and then sent to the recipient's address from your email provider. We use a few IP addresses to send email requests to the sender's email providers and those IPs might be blacklisted by your email provider therefore, emails may get failed due to this reason. In this case, you must contact your email provider and get our IPs whitelisted.

In case of any temporary issue.

Sometimes, the email server responds with this error if some limits have been reached or you’re sending “too fast.” Please pause your campaigns for a while and try again later. If you are sending via Amazon SES, you must have verified the from, reply-to, and bounce address you are using in your mailings.

FAQs (Frequently Asked Questions)

I have a lot of failed emails. Does it mean the email is not working, or does it mean the email failed to be sent?

The failure can happen if the sender is rejected from sending emails by the ESP. Hence, you need to share the error are you receiving for the failed prospects in our live chat so that our support team can check.


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