Why are my emails being returned as undelivered?

The following are the reasons or causes for undelivered emails:

Invalid Email Address: The recipient's email address may be incorrect, misspelled, or no longer active.
Mailbox Full: The recipient’s mailbox is full and cannot accept new emails.
Spam Filters: The email may have been flagged as spam by the recipient’s email server or spam filters.
Server Issues: The recipient’s mail server may be temporarily down or experiencing technical difficulties.
Blocked Sender: The recipient may have blocked your email address or domain.
Attachment Size Too Large: The email contains attachments that exceed the recipient’s mail server size limits.
DNS Issues: Problems with the Domain Name System (DNS) of either the sender’s or recipient’s email server.
Expired Domain: The recipient's email domain has expired or is no longer active.
Blacklisted IP Address: Your sending IP address has been flagged for spam, causing emails to be rejected.
Authentication Issues: Missing or incorrect email authentication (SPF, DKIM, DMARC) may lead to rejection.
Temporary Network Issues: Temporary connectivity problems between servers can result in delivery failure.
Recipient Server Policies: The recipient’s server may have strict rules or configurations that block your email.

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