[DATE, ex. Monday, March 31, 2008]

[NAME, COMPANY AND ADDRESS, ex.
Link Building
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]

Dear [NAME, ex. Link Building],

Allow me to apologize for shipping you [PRODUCT(S), ex. our Magnaflux compressor] without including any documentation.  I am enclosing the missing documents with this letter.

I am certain you will be pleased with [PRODUCT(S), ex. the compressor].  We appreciate your business and look forward to dealing with you in the future.

Sincerely,

[YOUR NAME, ex. Jill Jones]