Line Wrap on outgoing mail has been broken for over a decade? (But only when sending through MS Exchange)

Hey everyone,

Please tell me if I’m crazy, but I and several others appear to have been fighting to fix this issue in eM Client for over a decade now. Much of it appears in this (now dead?) thread here… https://forum.emclient.com/t/disabling-of-line-wrap-in-outgoing-plain-text-mails/41514

I have tested this a million different ways. I’ve sent the exact same emails from eM Client, Thunderbird, Outlook, and countless other mail programs. eM Client continues to be the only email program that I can find which breaks outgoing messages, but there’s a catch… it only happens when eM Client is sending outbound mail through an MS Exchange server.

I am going to try to post some screenshots so folk can see what i mean here, if possible. But effectively, the breakdown of variables is…

email sent through an IMAP server when I am using eM Client… totally fine 100% of the time

email sent through an Exchange server when I am using Outlook as an email client… totally fine 100% of the time

email sent through an Exchange server when I am using Thunderbird as an email client… totally fine 100% of the time

email sent through an Exchange server when I am using eM Client… line wrap disaster.





additional post to show some additional screenshots of the other tests that I did…





… i also have the raw message source that I can try to share or attach here, in the hopes that some folk who know a lot more about email handling on the server side might perhaps be able to figure out why things are so broken when i use eM Client to send outgoing mail through an Exchange server.

This is a snippet view of the source of one of the “good” messages…

and I’m happy to paste in the entire message source if that helps…

Received: from BY1PR18MB5375.namprd18.prod.outlook.com (2603:10b6:a03:528::20) by
 SA1PR18MB5792.namprd18.prod.outlook.com with HTTPS; Thu, 2 Oct 2025 19:58:00
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From: "Deviant Ollam" <[email protected]>
To: "Deviant Ollam" <[email protected]>
Subject: Test email sent using eM Client from [email protected] (IMAP) to
 [email protected] (Exchange)
Date: Thu, 02 Oct 2025 19:57:53 +0000
Message-Id: <[email protected]>
Reply-To: "Deviant Ollam" <[email protected]>
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--></style></head><body em_lighttheme_added=3D""><div>There is, for some re=
ason, something especially grim about pubs near stations, a very particular =
kind of grubbiness, a special kind of pallor to the pork pies.&nbsp; Worse =
than the pork pies, though, are the sandwiches.&nbsp; There is a feeling w=
hich persists in England that making a sandwich interesting, attractive, or =
in any way pleasant to eat is something sinful that only foreigners do.&nb=
sp; &quot;Make 'em dry,&quot; is the instruction buried somewhere in the co=
llective national consciousness, &quot;make 'em rubbery.&nbsp; If you have=
 to keep the buggers fresh, do it by washing 'em once a week.&quot;&nbsp; It =
is by eating sandwiches in pubs on Saturday lunchtimes that the British se=
ek to atone for whatever their national sins have been.&nbsp; They're not a=
ltogether clear what those sins are, and don't want to know either.&nbsp; S=
ins are not the sort of things one wants to know about.&nbsp; But whatever=
 their sins are they are amply atoned for by the sandwiches they make themse=
lves eat.</div></body></html>

And this is a snippet view of the source of one of the “mangled” messages…

again, I’ll paste in the entire message source here if that helps…

Return-Path: <[email protected]>
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From: Deviant Ollam <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Test email sent using eM Client from
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Thread-Topic: Test email sent using eM Client from
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Date: Thu, 2 Oct 2025 19:58:26 +0000
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Content-ID: <[email protected]>
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Here is a real-world example screenshot of how the problem manifests for the parties receiving emails like this. (Some folk get this, other people in other threads have had challenges understanding so I’m thinking images will help?)

If someone’s screen does not have enough horizontal space for a line of text, it will naturally wrap to the next line when displaying email. That makes sense.

What ruins everything, however, are those darned hard-coded paragraph breaks which now pop up in the middle of the following line and that causes a message to look like a mess. Let’s compare two images…

… and, again, this only happens with outgoing messages being (a) composed and sent using eM Client when (b) they are sent through an MS Exchange server.

The problem is particularly acute when you consider how many people read their email on mobile devices nowadays. Mobile email clients almost NEVER have enough horizontal space to display an email easily, so line-wrapping occurs constantly. And when the “eM Client / MS Exchange message mangling” bug hits, it makes those messages almost illegible if your recipient is on a mobile device.

Here’s what a “good” email looks like when viewed on a mobile device. There are not hard carriage return or line break characters in the message source, so the mobile email client can wrap the text as it sees fit in order to make best use of the phone’s display…

But here is how an email sent using eM Client and dispatched through an MS Exchange server will look if your recipient tries to view it on a mobile device. The niusance line breaks in the message source play absolute hell with the display of the email on the recipient’s mobile screen…

FWIW it does NOT happen here.

macOS 26.1 beta (Tahoe), sending mails with eM Client 10.3.2622 through MS Exchange server:
No carriage returns inserted, continuous text stays continuous.