How to Append String at the end of a Given a Column in SQL Server?

Question

I have a project I am working on. based off a backup SQl Server database from a production server. They have over 16,000 user email addresses, and I want to corrupt them so the system (which has automatic emailers) will not send any emails to valid addresses.

But I still want the users, and I want them in a way that I can reverse what I do (which is why I dont want to delete them).

The SQL I am trying is:

UPDATE Contact SET
EmailAddress = EmailAddress + '.x'

But it isnt working, what am I doing wrong?

Error Message is as follows:

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Microsoft SQL Server Management Studio Express
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SQL Execution Error.

Executed SQL statement: UPDATE Contact SET EmailAddress = EmailAddress + '.x'
Error Source: .Net SqlClient Data Provider
Error Message: String or binary data would be truncated. The statement has been terminated.
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OK   Help   
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Answer 1

The issue is that EmailAddress +".x" results in some of your data being to long for the given field. You could do:

select * from Contact where len(EmailAddress +".x") > LENFIELD

Replace LENFIELD with the length of the column defined on the table. If you just want to mung the data why not just set all the fields to a single email address? Or modify the rows that are causing the error to occur to be shorter.