Email Hygiene
The set of practices used to maintain a clean, healthy email list by removing invalid, inactive, and risky addresses.
Email hygiene refers to the ongoing process of maintaining a clean and deliverable email list. Just as personal hygiene prevents illness, email hygiene prevents deliverability problems like high bounce rates, spam complaints, and blacklisting. It encompasses both verification (checking if addresses are valid) and list management (removing disengaged subscribers).
Core email hygiene practices:
- Regular verification: Run your full list through SendSure at least quarterly, or monthly for high-volume senders
- Real-time verification: Validate emails at the point of entry (signup forms, imports) to prevent bad data from entering your list
- Sunset policies: Remove subscribers who haven't engaged in 6-12 months
- Bounce management: Immediately remove hard bounces; suppress persistent soft bounces
- Complaint processing: Automatically unsubscribe anyone who marks your email as spam
- Duplicate removal: Deduplicate your list to avoid sending multiple emails to the same person
The cost of poor hygiene: A list that isn't regularly cleaned decays at 2-3% per month — meaning 25-30% of your list becomes invalid every year due to job changes, company closures, and abandoned mailboxes. Sending to a decayed list wastes money, damages sender reputation, and can get your domain blacklisted.
Related Terms
Email Verification
The process of confirming whether an email address is valid, deliverable, and belongs to a real person.
Bounce Rate
The percentage of emails that could not be delivered to the recipient's inbox.
Sender Reputation
A score assigned by ISPs to your email sending domain/IP that determines whether your emails reach the inbox.
Engagement Rate
The percentage of email recipients who interact with your emails through opens, clicks, replies, or forwards.
Want to learn more?
Read our in-depth blog posts on email verification and deliverability.