Marginally Useful...

You did not enter an email address. MailSprocket does not work unless you enter an email address that is valid.
If you don't enter an email address MailSprocket will not work.
Your email address is too long. Please use a shorter email address.
Size does matter. Your email address is too long. Usually a sign of bad behaviour.
It appears you did not write an email message. MailSprocket does not work unless you write a message.
You need to actually write a message for the form to work.
It appears you tried to send something that is not text. Please send text.
Only send text please, trying to send other data is not allowed.
Your message is too long. Please write a shorter message.
Some people try to fill up mail boxes through abusing mailforms. We restrict the size for your protection. This is a contact form, not a place to type your doctoral thesis.
You did not enter a name. MailSprocket does not work unless you enter a name.
How is the recipient going to know who you are?
Your name is too long. Please enter a shorter name.
Is your name really longer than 127 characters? Use a nickname.
It appears that you did not enter a subject. MailSprocket does not work unless you write a subject.
MailSprocket enforces good behaviour. Set a subject.
Your subject is too long. Please enter a shorter subject.
Just the facts please. No need to tell us your life story.
It appears your email address is not valid. Please use a valid email address.
Now, we aren't saying you are a bad person, but it appears your email address is not valid. Use a different one.
The administrator of MailSprocket did not change the passphrase. Please contact the administrator.
Either the MailSprocket admin is dumb, or you are trying to use MailSprocket before the admin made it live.
Passphrases do not match. Please contact the administrator.
Either the MailSprocket admin is dumb, or you are trying to crack MailSprocket.