Submit Documentation FeedbackJoin Developer Community
HomeGuidesAPI Reference
Submit Documentation FeedbackJoin Developer CommunityOptimizely GitHubOptimizely NuGetLog In
Optimizely GitHubOptimizely NuGet

**Type**: void

**Parameters**

NameTypeValue
sessionIdStringID of the session
mailingIdlongID of the mailing
NameStringField name<br><br>Must be compliant with RFC822 (only 7bit US-ASCII characters are allowed).
ValueStringValue of the header field<br><br>Must be compliant with RFC822 (only 7bit US-ASCII characters are allowed).

**Return values**

  • **Code structure**