" firewall Archives - LuxSci

Posts Tagged ‘firewall’

Where’s the Email? Diagnosing and Resolving Issues with Missing Email

Monday, December 1st, 2014

In many ways, the Internet is still like the Wild Wild West. Email messages sent to you or from you can and do “go missing” for no apparent reason.  This can happen no matter what email provider you use. So, what happened to these “AWOL” messages?  How can you diagnose and solve the problem?

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Alternate SMTP Ports – Send Email From Any Location

Tuesday, September 10th, 2013

When sending outbound email from an email program (like Outlook or Thunderbird) or from a mobile device (like iPhone or Blackberry) that is not using Premium MobileSync, your program or device connects to our outbound email servers using an Internet protocol called “SMTP” (The Simple Mail Transport Protocol).

An email server, however, does lots of different things in addition to sending outbound email.  It may allow checking of email via POP or IMAP, or checking your address book using LDAP, or other things. So, when your email program connects to the server it has to specify what it wants to do (i.e. send an email).  It does this by connecting to a numbered “port” on the server.  Port number “25” is the Internet standard for “regular outbound email”.

However, because port 25 is standard for outbound email, many ISPs, wifi networks, hotels, airports, and other locations that provide Internet access will arbitrarily block any connections to servers (except perhaps their own) on port 25 in order to stop spammers from using their services for the sending of spam, viruses, or malware and to prevent their IP addresses from being black listed.

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Ultimate Control: Manage Access to Your Services with Custom Firewalls

Saturday, October 13th, 2012

Can I block this one IP that is scanning our accounts?  Can I restrict my account so that people can only access it from our office network, or require that they authenticate to WebMail first (using two-factor authentication)?

LuxSci is constantly asked for fine-grained access controls by customers who are in shared environments (sharing the same servers with many other accounts).  However, blocking access from IP addresses globally at the request of one customer may potentially affect other customers using the same system.

That is, until now. LuxSci customers can now configure their own custom firewalls to allow and deny access as they see fit without affecting other customers sharing the same server(s).

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