One of my frustrations with Gmail is that when I try to paste something with 'tabs' in it, Gmail strips them. This becomes an issue when sending code snippets to mailing lists, etc where my nicely formatted code gets all smushed and gunked up. ( Yes, those are the correct technical terms )
This has annoyed me for years until it occurred to me that I could easily fix it by having tabs automatically converted to spaces when pasted into a compose window in Mailplane. I'm also using Paste and Match Style but you could use regular Paste as well.