When you send an email to someone, a lot of processing takes place on the backend before the email reaches the recipient. The processes work as follows:
- You compose and send an email from your email client.
- The email client connects to the “Outgoing SMTP” server and delivers the email in “MIME” format.
- Outgoing SMTP verifies the sender details and processes the message for sending and places it in the outgoing queue.
- SMTP server looks up the “ DNS Server ” of the domain according to the domain details in the recipient address and gets the Receiver server information of the recipient domain.
- Then SMTP Server connects to Receiver email server and sends the email via SMTP protocol .
- The recipient server in turn buy phone number list verifies the recipient account and delivers the email to the users mail account.
- The user views the received email using the email client.
So what happens when the email doesn’t reach its destination?
When an email you send isn’t delivered, you’ll get an error message. An email bounce message will also tell you what caused your email to not be delivered.
What are the Causes of Mail Delivery System Error?
To ensure that all your emails reach install woo commerce to create your online store their destination, it is important to understand the causes of an email delivery failure ( mail delivery system error ).
There are many reasons why an email might not be delivered. We’ve listed the most important ones below:
1. Bounces
Sometimes you may not be able to deliver an email for very simple reasons. For example, you may get an error when the recipient’s email capacity is full or the address does not exist. If the recipient’s email capacity is full, just wait a bit and resend your email. If the address does not exist, remove the account from your list.
2. Malware Attack
Have you ever received a “Mail Delivery Failure” notification for emails that you never sent ? If so, you may have been hit by a ukraine business directory malware attack. In such a case, a virus uses your account to send spam emails. This is why you get so many email delivery errors .
3. SMTP Problems
An email can always be blocked by an anti-spam filter, so it cannot reach the recipient’s inbox.
If you are wondering what could be the reason for this, it could be your SMTP server.
4. Invalid Domain Name
When you send an email to an invalid domain name, the SMTP server is unable to look up DNS information for the specific domain name. In this case, the email is bounced because it cannot be delivered by the SMTP server itself.
Example: Let’s say you’re missing a letter from the email address [email protected]. In such a case, since it wouldn’t be a valid domain name, the DNS Lookup would fail and the domain name would be considered an invalid domain name.
5. MX Record Not Found
When you send an email to a valid domain name, if there is no MX record for the domain name, the email will be bounced back as undeliverable by the SMTP server.
You can use the Expert Mail MX Record query tool to query the MX record .
6. Email Policy Violation
The recipient email server may have certain restrictions or email policies that apply to incoming emails. If the email you send violates such policies, your email may be rejected by the recipient server.
Apart from the common reasons above, recipient email servers may reject or bounce emails due to various reasons and errors. Most of the time, the bounced email contains the reason why the email was rejected.