Why are my emails getting bounced?

Emails can bounce for reasons such as invalid email addresses, full mailboxes, blacklisted sender IP/domain, missing SPF/DKIM records, large attachments, or suspicious content. Cleaning up your email list and ensuring proper conﬁgurations can reduce bounce rates.

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Related Articles
Why are my emails getting bounced?
Marketing emails may bounce due to invalid or outdated email addresses, full inboxes, blocked domains, or poor sender reputation. Technical issues such as missing SPF/DKIM records, blacklisting, or sending from unveriﬁed IPs can also cause bounces.
What does “bounce rate” mean?
Bounce rate = (Number of bounced emails / Number of emails sent) × 100. It includes both hard (permanent) and soft (temporary) bounces.
Will my emails bounce if my domain is not authenticated?
Not necessarily, but failing to authenticate your domain (using SPF, DKIM, and DMARC) increases the chance your emails may be marked as spam or rejected by recipient servers. This can lead to higher bounce rates and poor deliverability. Domain ...
Why is a valid email address getting bounced?
A valid email address may bounce due to temporary server issues, a full mailbox, strict spam ﬁlters, or incorrect domain settings (e.g., SPF/DKIM). Even valid addresses can bounce if the recipient server rejects bulk emails or if Zoho’s IP is ...
What does a soft bounce mean?
A soft bounce is a temporary delivery failure, typically due to the recipient’s mailbox being full or technical issues on the recipient's email server.