Using To-Header for envelope address

Hi together,

I am new to getmail and struggling with an setup for multiple clients.
I selected the MultidropIMAPRetriever. Incoming mails are collected with
an catchall-address for the whole domain.

The example suggests Delivered-To:1 as envelope_recipient. But in my
case this always contains the Catchall-Address, so I tried to use the
To: header.
getmail then stops with an error: the to header field does not record
the envelope recipient address

Why is it not allowed to use the To: header? Seems a legit option to me.

Other questions I stumbled over:
- is StartSSL supported?
- can I use regex groups in locals? Something like ("(.*)@domain.com", [\1])

My current configuration is attached. Thank you for any help.

Best regards

Robert Schönherr

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[retriever]
type = MultidropIMAPRetriever
server = mydomain.de
username = [email protected]
password = **********
mailboxes = ("INBOX", "Junk")
move_on_delete = mail.deleted
#envelope_recipient = Delivered-To:1  # this works, but is always [email protected]
envelope_recipient = To:1                     # this doesn't work

[destination]
type = MultiSorter
default = [unknown]
locals = (
    ("[email protected]", "[test]"),
    ("[email protected]", "[admin]")
    )

[test]
type = Maildir
path = ~/test/Maildir/

[admin]
type = Maildir
path = ~/admin/Maildir/

[unknown]
type = Maildir
path = ~/unknown/Maildir/