How the fuck am I going to make a fucking email signature appear the same everywhere when the client insists in using a piece of shit software called Outlook and I am a goddam backend developer.

I don't give a shit about spacing and color and stupid fucking fonts.

Thank for listening. Have a great day.

Create a table in word, copy/paste to outlook signature.

Profit $$

You know.... In most orgs, those are maintained by the IT dept.

@sariel lol, the dev with the masters degree in CS is the IT department. I keep telling him he is the master of printer repair.

You won't. There are pretty solid lists on the internet to tell you what HTML features you can reliably use in email, but be ware that you'll be making 9-squares with tables and still not have any tangible proof that all email clients will render it without arbitrary extra margins.

Bare with me now... Images...

Plain text.

No, seriously: It will look the same for everyone even when HTML is turned off and attachments (including images) are filtered at the corporate mail server.

Fancy grafics and styling is what the landing page is for.

@Oktokolo agreed. The client is just completely insane. He is basically a know it all that. I'm glad my contract is about to expire with that douche.

Codetwo does this. Basically interfaces with Outlook and M365 and allows for company wide email templates that get added when emails are sent.

Oh boy! Good luck with that.
It's easily the worst "dev" task to do, especially when you're the only one who can code in the IT department (I've been there).

@arcadesdude even Xink can do that.

Get's users from the AD, we as IT have no more work. We let marketing design new signatures for each department.

You can pass the problem off to a bunch of guys called the 'email monks', who will sort it for less than 100 USD. If you want to do it yourself, there are online checkers that will create views of your code as presented by different email clients. There are templates and code examples online. In general, email layout uses tables for layout and supports very basic CSS. Copy and modding an existing signature is a good way to go and there's no complexity to changing the name of a font. Give it a go?

@Berkmann18 yeah. Gonna get a Outlook T shirt for Halloween.

@spongegeoff good idea. At this point I'll need to call the cavalry. Wasting too much tim on this.

Send emails in plaintext format.

I should mention that the most straightfoward way to reference images - such as a company logo - is via absolute links e.g. https://theircompany.com/images/...
...don't make the mistake of referencing files only stored on your local drive!
There are other ways to deliver images, but simple is best in most cases.