Handling of configured email addresses

[mschwemer]

There are currently several issues and pull requests open, regarding the topic of e-mail addresses and SPF.

I think, we must review and (maybe) refactor this area.

This ticket is to collect all open tickets and PRs to have an overview:

• impossible to overwrite receiver senderEmail when double-opt-in is active #737 impossible to overwrite receiver senderEmail when double-opt-in is active
• Disclaimer mail doesn't use correct sender mail #692 Disclaimer mail doesn't use correct sender mail
• ReturnPath not working anymore #668 ReturnPath not working anymore
• [BUG] plugin.tx_powermail.settings.setup.receiver.overwrite.replyToEmail.value is ignored #557 plugin.tx_powermail.settings.setup.receiver.overwrite.replyToEmail.value is ignored
• SPF-Issue with yahoo-mails and replytoEmail for receiver #502 SPF-Issue with yahoo-mails and replytoEmail for receiver
• [TASK] respect sender.default.senderEmail for sender mail TO fallback #742 respect sender.default.senderEmail for sender mail TO fallback
• [BUGFIX] set sender instead of returnPath #677 [BUGFIX] set sender instead of returnPath
• [BUGFIX] empty replyToEmail error for optin mails if settings.flexfor… #630 [BUGFIX] empty replyToEmail error for optin mails if settings.flexfor

[einpraegsam]

Some of the issues should be fixed with #772 now

[mschwemer]

Can be closed as all referenced issues / prs are resolved, deleted or merged