Horizontal vs. Vertical centric email signatures

1. Should an email signature be centered?
2. What is the etiquette for email signatures?

Should an email signature be centered?

Email signatures should always be left aligned

All emails are left aligned, so inserting an email signature at the bottom of the email that is center aligned doesn't look right.

What is the etiquette for email signatures?

The recipient will want to know who you are. So, give them that information through a professional email signature. At the bare minimum, this should state your full name, job title, company name, phone number, and email address. This applies to both desktop and mobile emails.