What is the optimal size for an email newsletter layout?

Question

Email

Good afternoon guys.
Happy holidays everyone!
You need to draw an email layout, which will contain text with links to confirm registration, a couple of social network buttons, appstore, google play, windows market buttons. Also a couple of announcements of articles from the site.
What are the best layout widths to try to fit into?
Is it worth screwing non-standard fonts, or do you get by with system ones?
Thank you

Answer 1

Max 600 pixels wide to fit everywhere)
Use only standard fonts. Only they normally work in mailers.
If you really want to, then you can, of course, but then they will then need to be inserted as a picture into the letter.

Answer 2

The coder said that 600 px. and at the expense of the left Open Sans did not arise)))