A/B tests with the word "rest" in a subject line will not pass validation
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A/B tests with the word "rest" in a subject line will not pass validation

Marketing Cloud Email Studio

Last updated 19 days ago ·Reference W-7170507 ·Reported By 3 users

Fixed in version Marketing Cloud Release May 2020

Summary
When creating an A/B Test send, and using the Test Type ‘Subject lines’, using the word “rest’ (in lowercase letters) in one of the subject lines results in a validation error.

Repro
1. In your MC account, create an A/B Test
2. Select “Subject lines” for the TEST TYPE
3. In one of the Subject lines, use the word “rest”
4. Click Next
5. Select your Recipients
6. Click Next. You will receive a validation error. If you change “rest” to another word, this will not occur.

Workaround
Capitalize the word "Rest" and it will pass validation.
Another potential workaround is to breakup the word "rest" using AMPscript. It will bypass this bug. It will display as "rest" in the delivered email, but in the application it will still display as the AMPscript.

%%=v('re')=%%%%=v('st')=%%

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