The Error 550 is a message you get when an email you’ve sent is blocked or rejected by your recipient’s mail server, usually because the address might be seen as spam, doesn’t exist or the server isn’t allowing any messages from your email address.
To fix the blocked or rejected email error 550, you can use these steps:
1. Inspect email content: Check your email content and subject line for spam-like characteristics, including certain trigger words or phrases that could be causing the emails to be rejected
2. Check SPF record: Make sure that your domain name’s SPF (Sender Policy Framework) record is correctly set up. This DNS record tells receiving email servers which servers are authorized to send email on behalf of your domain
3. Verify your information: Make sure your email address is correctly formatted and that you have a valid reply-to address, as a missing or incorrect email address can often trigger this error
4. Reduce sending rate: If you’re sending a large volume of emails, try reducing the rate at which you send them as some email servers have rate limits.
5. Update your email app: Make sure that your email application software is up to date, as outdated software can sometimes lead to sending issues
6. Switch SMTP ports: Some internet service providers block certain SMTP ports. Try using another port for outgoing mail on your email app. If you’re using 587, switch to 465 – or vice versa.