ZF2-361: encodeQuotedPrintableHeader can't calculate the length of the first line

Description

The first line of a header has the Field Name follow of ":", since that encodeQuotedPrintableHeader doesn't have the knowledge about the length then the first line will brake all length restrictions when the return value is concatenated with the

Comments

This issue has been closed on Jira and moved to GitHub for issue tracking. To continue following the resolution of this issues, please visit: https://github.com/zendframework/zf2/issues/2491