Email address validation

One thing anyone collecting email addresses anywhere has to think about is address validation. How do you prevent users from typing bad addresses into your forms?
I ran into this yesterday attempting to take an online quiz. Before I was allowed to take the quiz, I had to provide my name, phone number and email address. Initially I attempted to use a tagged email address. This is one that delivers to my wordtothewise.com mailbox, but lets me identify who I initially gave the address to. The form wouldn’t let me give a tagged address “contains invalid characters.” Well, no, it doesn’t, but there are a lot of websites that think + and – and other characters are invalid.
So what did I do? I ended up using a yahoo address associated with my yahoo IM account. An account that may actually not be accepting mail any longer as I rarely log into it.
What did address validation get them in this case? Well, it got them an address I don’t read and may not even be active rather than the address I wanted to give them which would have delivered directly to my primary mail box. Somehow I don’t think this solution is really ideal for them. (It’s great for me, I’ll never know if they ever attempt to contact me.)
Coincidentally, UserGlue posted about email address validation and alternatives to “make them type their address twice.” (Do people do this? I typically cut and paste my address instead of retyping.)
How are other people validating email addresses?

Related Posts

Three ways spammers get your address

Paul explains 3 ways spammers get your email address.

Read More

What is an email address? (part three)

As promised last week, here are some actual recommendations for handling email addresses.
First some things to check when capturing an email address from a user, or when importing a list. These will exclude some legitimate email addresses, but not any that anyone is likely to actually be using. And they’ll allow in some email addresses that are technically not legal, by erring on the side of simple checks. But they’re an awful lot better than many of the existing email address filters.

Read More

What is an email address? (part two)

Yesterday I talked about the technical definitions of an email address. Eventually on Monday I’m going to talk about some useful day-to-day rules about email address acquisition and analysis, but first I’m going to take a detour into tagging or mailboxing email addresses.
Tagging an email address is something the owner of an email address can do to make it easier to handle incoming email. It works by adding an extra word to the local part of the email address separated by a special character, such as “+”, “=” or “-“. So, if my email address is steve@example.com, and I’m signing up for the MAAWG mailing lists I can sign up with the email address steve+maawg@example.com. When mail is sent to steve+maawg@example.com it will be delivered to my steve@example.com mailbox, but I’ll know that it’s mail from MAAWG. I can use that tag to whitelist that mail, to filter it to it’s own mailbox and a bunch of other useful things.
In some ways this is similar to recent disposable email address services, but rather than being a third party service it’s something that’s been built in to many mailservers for well over a decade. It doesn’t require me to create each new address at a web page, instead I can make tags up on the fly. And it works at my regular mail domain.
If you’re an ESP it can be interesting to look for tagged addresses in uploaded lists. If it’s a list owned by Kraft and you see the email address steve+gevalia@example.com in the list, that’s a strong sign that that email address at least was really volunteered to the list owner. If you see the email address steve+microsoft@example.com then it’s a strong sign that it wasn’t, and you might want to look harder at where the list came from.
One reason that this is relevant to email address capture is that tagged addresses are something that you should expect people, especially more sophisticated users of email, to use to sign up to mailing lists and that they’re something you don’t want to discourage. Yet many web signup forms forbid entering email addresses with a “+” or, worse, have bugs in them that map a “+” sign in the email address to a space – leading to the signup failing at best, or the wrong email address being added to the list at worst. This really annoys people who use tagged addresses to help manage their email, and they’re often exactly the sort of tech-savvy people who make a lot of online purchases you want to have on your lists.
More on Monday.

Read More