1*atext) dot-atom = [CFWS] dot-atom-text [CFWS] [CFWS] means comment or whitespace. Salesforce will not allow this, so it forces us to enter an incorrect address or leave it blank. Now it doesn't matter. The short answer is yes, email addresses can include these characters, but with some exceptions. We’d like to clarify the things that matter when making a choice – so you can avoid making a bad decision. Answer (1 of 14): If you need to place an underscore while typing an email contact address, you should hold the shift button down and then press the button on the right of the zero buttons, this will type an underscore. So let’s get right to it, here’s what you need to know. Let’s look at each in a bit more detail. The two biggest factors to consider are hyphen placement and email service provider. You can follow the question or vote as helpful, but you cannot reply to this thread. That's it. An email address identifies an email box to which email messages are delivered. So the first part of an email address can be a dot-atom, which in turn begins with an atext, which can be an underscore. Then next we want to click add to chose the SMTP address format of the Email Address Policy. The topic of spaces vs. dashes vs. underscores continues on with respect to how to use them (or not) when naming your files. when replying to an email address with an underscore (_) it changes to a period (.) This thread is locked. No spaces, other punctuation, no slashes, no parentheses. More information. Do they also accept the same email address without the dot. Why on God’s green earth would you want to use an underscore - a special character which requires everyone who types it to look at their keyboard and press the shift key an additional time - in an email address? Remove the special characters from the proxyaddresses attribute of the user account in the on-premises environment. Your email address speaks volumes about how professional you are and if somebody can trust you. Any number or letter, dot (. I signed up as [email protected] and then straight after tried to get [email protected] but couldn't. email address with an underscore (_) it changes to a period (.) Some of companies are now using an underscore in the domain portion of the email address. You have no power in impressing your recipient with cracking content inside your email, because they might not open it. Insert one or several dots (".") It would be great if Saelsforce would allow "_" to be used in the domain portion of the email address. The same goes for capitalization. For example, if your name was [email protected], you could send mail to [email protected] or [email protected] Note that there is no option to chose an underscore in the below screenshot. There's a standard for email that applies to all email providers. Resolution. An email address has more significance than you think. 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