VPNs are often targeted because they allow the spammers to rapidly shift between VPN servers when one becomes blocked. A huge number of companies use spam blacklist services like Spamhaus to deal with the enslaught of spam. Kerio MailServer is able to check the delay of reply to SMTP greeting. I would recommend reading through the Spamhaus website to learn more on what that service is and what it does. ration/Spam Filter), to prevent misuse of the mail server for sending spam email. The spam blacklists are external to ISPs and are shared. It may also depend heavily on which country the VPN server is in that you are trying to use as well. The VPN provider is not assigning a single IP to you. You are connecting through a shared server with hundreds or thousands of other users. Telus has no control over anything that happens with your VPN and they are not causing the problem with your VPN and inability to send email. When I use NordVPN, I am able to send email through Telus' servers with no problem, so the issue will be with your VPN provider.ĮxpressVPN has only so many servers and hundreds of thousands of users if not more. Telus will not provide technical support for your VPN problems.
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