I am looking for an email client that allows me to specify an arbitrary sender a

Question

I am looking for an email client that allows me to specify an arbitrary sender adress each time I send a message without explicitly creating a new identity. Especially when I hit reply to, it should use the recipient adress of the original email as sender. I am looking for Linux and Windows GUIs (e.g. Thunderbird) and/or Webmail (e.g. Roundcube). Open-source software is strongly preferred.

I have a domain, example.com where I catch all email. Let's say I buy something from a webshop that requires an email, I use awebshop@example.com to sign up. That way once they start spamming me or leaked my email I can simply block it. Now let's say I want to contact or respond to their customer support via email. Then I would like to also use awebshop@example.com to send a message. Currently with either Thunderbird or Roundcube I have to create a new Identity I am looking for a way to make that more simple.

Clarification: I want to keep the emails on my server. I am not looking for a service but a software that I can run either on my server and/or my computers that connects to the server via IMAP.

Explanation / Answer

Here are the results of my personal research.

GUIs:

KMail: Very good support

Freetext from field
Multiple fixed identities can be created with one primary and associated emails
When replying to a mail it will select the identity that has the receiver email associated and send from the primary email of that identity
Custom sent folder can be set for each identity

Thunderbird: Poor support

Multiple identities can be created
Corresponding identity will be set manually when replying to a message sent to a non-default identity

WEB Interfaces:

Horde poor support

Multiple identities can be created
Easier if $conf[user][verify_from_addr] disabled (Horde/User Capabilities and Constraints)
Custom sent folder needs to be selected per mail

Roundcube poor support

Multiple identities can be created
Custom sent folder needs to be selected per mail
The correct identity is automatically selected in a reply, if the mail has been sent to it and the identity exists

SOGo no support

On the Roadmap "Email identities support in the web mail interface"

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