It's just natural that you see this. Some sites will never send you an email or do you see the email in the inbox for some site? Also note that even if one email arrived and submission starts, it is only removing the "email verification site" if the submission (login) was successful. If it was not, it will wait till it times out or it gets another email from that site.
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Newbie here
nevermind, foind it, there is a topic about it. And yes I guessed. Its link per minute
@krushinem any providers are welcome where I can fill this list with setup instructions...
http://docu.gsa-online.de/email_spider/email_provider_settings