Frequently Asked Questions - Tips and tricks

As a general rule of thumb, connecting to the same MX server in a small amount of time is a bad practice. Not only doing so could cause harm to it but you could be tagged as a spammer by modern mail servers.

EmailBatchVerifier, the type you should use to process batches of email addresses, uses a default interval of 30 seconds between multiple connections to the same SMTP server. You could, however, modify this interval adjusting the value of the BatchDomainSmtpConnectionInterval property (in milliseconds).