I’d like to introduce everyone to one of MDaemon’s newer features, a potentially powerful one that is woefully under-utilized. Here is the entry from the release notes:
*  SUBADDRESSING * Added support for subaddressing. Subaddressing is a system for including a folder name in an email address. Replies or emails sent to that email address will pull the folder from the address and move the message into folders automatically without the need to setup filtering rules. The syntax is: "mailbox+folder@domain". So, for example, the email address "firstname.lastname@example.org" would route messages directly into email@example.com's "ietf" IMAP folder (assuming that folder exists). Nested folders can be specified using period characters. For example, "firstname.lastname@example.org" would route messages directly into email@example.com's "industry\ietf" IMAP mail folder (again, assuming that folder exists). Underscores are used for spaces in folder names. For example, "firstname.lastname@example.org" would route messages directly into email@example.com's "my friends\frank" IMAP mail folder. The folder must exist prior to being used with subaddressing. Otherwise, the address will be treated as unknown. This is necessary to prevent abuse.
Oh, and good to know, you need to turn this feature on before you can use it:
A new switch has been added to the Filters tab within the account editor which will allow you to enable/disable subaddressing on a per account basis. As a result of the need to delimit using the + character this feature will be unavailable to accounts which include + in their email address local-part (mailbox). This feature can be shut down globally irrespective of individual account configuration via a new switch on the Misc Options|Misc UI. By default, each account has this feature disabled individually.
Okay, so with that out of the way, what can you do with this feature?
Well, say you’re a IMAP or WorldClient user most of the time, but want to use a cellphone that doesn’t support uploading sent messages to IMAP. No problem, have your phone automatically BCC mail to bob+Sent_Items@example.com (assuming you’re firstname.lastname@example.org, of course).
Another example would be to route mail you only want to receive for a short period of time directly to a specific folder, but then once you’re done with that fake address, delete the folder and instantly stop receiving mail.
I’ll have a few more goodies that build on subaddressing shortly, stay tuned.