Both!
A mailshot that is sent out without being followed up is a waste of money, infact there is a law in Narnia that says its illegal!
Not strictly true about the law bit but if you are going to the effort of doing a mailer, target it and follow it up. People get lots of mail, some will go straight in the bin, others will be left on the desk and one or two may action on it straight away, the idea of following it up is to give those who still have it on their desk a gentle prod, some will not be interested but some maybe and if they had not had the call may have lost the letter and gone elsewhere instead.
Failing that a couple of tips for you.
Get a great mailer done, give the recipient a reason to reply.
When sending them out do so on a staggered basis, so that follow ups are easy to do. Example 1000 mailers on Monday sent out, followed up on Wednesday, assuming directed to a contact may speak to 5-10 per hour (designated contact), to get halfway through could be 2-3 weeks after they receive the mailer and therefore may have forgotten or gone to another competitor and those at the end of the list may even get swept under the carpet.
Where as if you send 50 a day, its much easier to manage and if you do it by sector as well you may see a trend that allows you to improve your target ratio even more.
This is an area of business that I cover via
www.shasar.co.uk and if there is a requirement would be happy to quote or you are welcome to use one of the special offers which between now and Dec 25th 2006 get an extra 10% off.
Shay