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AddressValidation
a web service by Extreme Messaging

Overview
Extreme Messaging's Address Validation service allows companies to quickly validate email addresses, mailing addresses, phone numbers, and credit cards as users signup, and to validate pre-existing lists, automatically correcting the most common mistakes.

Key Features
Verifies that the local part of the email address
Checks the address against all the relevant RFCs
Extreme Messaging works with the postmasters of large domains to allow us to check the additional, domain-specific, rules that they apply.
Verify the host part of the email address
Check the top-level domain (e.g. 'edu') to quickly catch many typos
Check the host name against relevant RFCs
Perform DNS lookups for MX, A, and, when necessary, NS records
Cache DNS results for good performance
Recommend corrected email addresses
Correct common errors in top-level domains
Correct common mistakes in large domains
Correct addresses when domains change names
Verify the zip code, city, and state
Validate street addresses and zip codes to ensure a second contact method for users
Verify the phone number
the phone number given is for a valid country code
area code given is valid for the country
subscriber portion follows all country-specific numbering rules
Verify the credit card number
card number is a legal card number for the card type (e.g. Visa) provided

Key Benefits
Validate and Correct Address Lists
Remove bad addresses to save money on delivery costs
Correct common mistakes to increase the number of good addresses on your list, increasing its value
Validate Information in Real time
Alert users to errors so they can correct them before you lose the opportunity to get a correction