[Tickets #14883] Disposition-Notification-To: header parsing

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Ticket URL: https://bugs.horde.org/ticket/14883
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  Ticket             | 14883
  Created By         | viktor at szepe.net
  Summary            | Disposition-Notification-To: header parsing
  Queue              | IMP
  Version            | Git master
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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viktor at szepe.net (2018-12-19 19:14) wrote:

Hello!

Protonmail puts this header into the message:

Disposition-Notification-To:  
=?UTF-8?Q?SZ=C3=89PE_Viktor_<websmarter+readreceipt at protonmail.ch>?=

See https://tools.ietf.org/html/rfc3798#section-2.1

This is the corresponding log line in my MTA:

error,relay=::ffff:173.212.197.142,from=<viktor at szepe.net>,to=<?=>:  
513 Syntax error.

Could it be that IMP does not expect a name in this header?

Thank you for developing Horde!