Glossary
Subject line
The line that tells the reader what a message is about, shown in the inbox.
ValidReach Team · Updated 2026-10-26
In practice
Say what is inside, plainly, and keep it short enough to read on a phone. A subject that misleads can break the law in some places, and it trains people to ignore you. Test two versions on a small slice.
Verification and sending
Not related to verification. A good subject line does nothing for a bounced message.