so, you're sending follow up emails to agents, or you're responding to an email from an agent.
Checked your spam blocker lately?
I cannot tell you how much I hate being asked to fill out little forms when I'm responding to an email from someone asking for information from me. You started the conversation, I'm not spamming you by sending a reply.
If you have spam problems, set up a clean email account and use it exclusively for your publishing stuff. Either that or double check that you've added my email to your ok list.
Kristin Nelson mentioned this in her response about e-queries. If her reply to you bounces back, she doesn't fill out the "please let me email you" form. She deletes it.
Just a word to the savvy query writer on this lovely Monday morning.