URGENT - please, newletter marketing op

Have an opportunity to do newsletter sponsor in exchange for an ad on my site. The newsletter spot needs to be filled.

Wondering if :

a) any concern about their subscribers (opt in etc) - do advertisers have spam liability when being set out by someone else? The company says the recipients are subscribed. (15,000+)

b) really need an agreement/insertion order if working a straight trade?

-Any replies much appreciated since I have less than a day to wrap it up.

1 - Yes you do. Your name is going on the email so while you may not be the one tied to CAN SPAM, you don’t want the brand association or possible inquiries if your name is all over spam.

2 - Agreements are generally a good thing. Necessary is relative to what people want.