Non-Delivery of emails breakdown into one of the four categories

  • Blocked
  • Soft-bounced
  • Hard-bounced
  • Retrying


Blocked

When the email has a deliverability issue and has no chance of reaching the recipient’s inbox, Mailjet will block it from sending. Examples include an invalid or non-existent email address, an email address that has already hard-bounced, or a recipient who previously reported your email as Spam.


Soft-bounced causes

A soft bounce is when an email is sent back to the sender, but only for temporary delivery issues. This can be because the user’s inbox is full, the server is down or the message is too big for the recipient’s inbox.


Hard-bounced causes

A hard bounce is when an email is sent back to the sender because it couldn’t be delivered for permanent reasons. It could be that the email address was typed incorrectly, or a fake one was entered because the subscriber was more interested in receiving the perk or offer for signing up than receiving your email.


Retrying

An email that is in status “retrying”, means we are attempting to deliver it and waiting for an update from the destination server. An update can take a couple seconds up to 24 hours. Once the 24 hours have passed, the emails is marked as a soft-bounce and will not be delivered.


Email Recipient Activity

  • Opened - The recipient opened the email.
  • Clicked - The recipient clicked on a link within the email (excluding the ‘Unsubscribe’ link).
  • Unsubscribed - The recipient unsubscribed from this contact list by using the ‘Unsubscribe’ link in the email.
  • Marked as Spam - The contact clicked on the ‘This is spam’ link that is added to the bottom of emails by some ISPs. Note: It is not possible to detect if a message is delivered directly to the Spam folder, so such instances are not included here.


Best practices for Email content:

✗ Do not use ALL CAPITALIZED WORDS in your subject line or body.

✗ Avoid using spammy type words (‘Free’, ‘Sale’, ‘Cash’, ‘Limited Time Offer’, etc). Spam Words to Avoid

✓ Keep your subject line between 35 to 50 characters long. The longer your subject line, the more likely it will be flagged as spam.

✓ Send content that your subscribers have signed up for and are expecting. If you send non-relevant content, your subscribers may mark you as a spammer. And the more people that open your newsletters, the better your reputation

✓ Send your newsletters consistently.