phpmailer

As a noun license is

(label) a legal document giving official permission to do something; a permit.

As a verb license is

the act of giving a formal (usually written) authorization.

Phpmailer is likely misspelled.

Phpmailer has no English definition.

As a noun version is

a specific form or variation of something.

As a verb version is

to keep track of (a file, document, etc.) in a versioning system.