Subject Line We forget things like:
Well, the requests from Rachel *do* get me...but that aside, what we try to do is really just write what we would like to hear from some other site...not what we want to tell them.
We forget things like:
Instead, we focus on each category and reference that in each subject line: It's like mentioning someone's name from time to time when talking with them...people like to hear words that relate to their own self interest, like their name (unless they're self-loathing, in which case you should say, "Hey dirt bag"), their site's topic of interest, etc. Oh, right...their site's topic of interest...
Again, we forget:
Instead, we focus on some aspect of the potential relationship between our sites (yes, relationship), that could make the other site owner feel good about having a relationship with us.
Yeah, I know, this is a more burdensome approach. On the other hand, the days of the easy link back are more or less gone, and if you think about it, assuming you have a good site yourself, striking relationships with other good sites may be the ticket here. But it's often gonna take a more personalized, often emotional approach.
Emotions worth considering in this regard include: 'admiration, belonging, comfort, envy, inclusion, power, reassurance, safety, success...'. The list goes on and on. ;-)
Of course, if this approach isn't your thing, then there's always, "Link to my site, or I'll kill this dog," but you must have an email client that can include a graphic of a cute dog if you're gonna take that route. That's more of a fear/sympathy based emotional approach.