Найденные страницы с тегом smtp relay всего 5529

The tale of a beach, dial-up, and port 25 blocking | Network World

Over the past year or so, we’ve addressed the issue of the SOHO market, cable and DSL services, and SMTP port 25 blocking (for sending e-mail) to servers other than those provided by the ISP. In particular, Steve made a move from BellSouth’s residential to business DSL service because of this blocking and his inability to get to his own server for SMTP (see this newsletter). Recently, the plot thickened with another service, but at least Steve was forewarned this time.

How not to deploy an application over a WAN | Network World

Last time, we discussed some of the characteristics that determine whether an application is WAN-friendly or WAN-vicious, and gave a feedback from a reader. Today, we are going to provide some additional insight into this topic from another reader. The reader worked as sales vice president for a carrier when it first introduced its frame relay service. One of the carrier's customers was a medical clinic that decided to run its medical appointment application over the carrier's frame relay network instead o

Move from frame relay and ATM to Ethernet services gains speed | Network World

As carriers step up the pressure on their corporate customers to migrate off older frame relay, ATM and private-line technologies and adopt IP networks, companies that make the switch are reaping the rewards of instant savings and improved service.

Not all carriers price MPLS services the same | Network World

In a previous newsletter, we discussed the fact that a number of IT organizations were implementing MPLS as a way to save money over their existing frame relay and ATM networks. Today, we will discuss MPLS pricing.

VPNs winning converts from frame relay | Network World

VPNs have pretty much buried frame relay as a WAN technology, according to a survey by Forrester Research.

Sprint Nextel getting ready to pull plug on legacy nets | Network World

Sprint’s legacy data networks are on life support. Frame relay and ATM customers need to make migration plans now.

Taking a LEMONADE stand to mobile messaging | Network World

The License to Enhanced Mobile Oriented and Diverse Endpoints (LEMONADE) Profile is a collection of open standards focused on making mobile communications cheaper and more efficient by making better use of bandwidth, among other benefits. The LEMONADE Profile (RFC 4550), which was approved on June 23, extends existing Internet messaging standards to make mobile messaging more efficient compared to using just SMTP and IMAP. A variety of existing IMAP and SMTP RFCs are included in the LEMONADE Profile.

Virtual management: Moving up the OSI stack | Network World

In the last newsletter, we discussed the move from "real" to "virtual" networks, concentrating more at the lower levels of the OSI stack. In particular, we noted that several years ago we moved from managing point-to-point circuits to managing virtual circuits for frame relay, ATM, and IP-based services.

Managing an MPLS migration | Network World

Last week, we discussed some of the "lessons learned" from early adopters who are moving toward MPLS. This week, we're covering some of the specifics for migrating to MPLS from legacy services, particularly frame relay.

What do I do if there is no TLS handshake? | Network World

Part 6 of a six-part article: Just because you checked a few boxes on your Microsoft Exchange Server does not mean that there is secure TLS encryption between your domain and another SMTP server that runs TLS. The golden rule that should guide the actions of any IT professional is testing. You must test your program and configuration before you turn it into production. Without a good test, you will create a disaster for yourself or even for the entire company.

Caller ID spoofing: Time to check your defenses | Network World

For years, we've used caller ID as an example of a "secure" identification, especially in comparison to the more "open" capabilities of IP and SMTP. For instance, it's common knowledge that one may set one's own IP address (even though it may or may not work in your network), and it's beyond "Simple" to spoof the "from" field in Simple Mail Transfer Protocol (SMTP).

The great networking debates | Network World

Networking's 50 greatest arguments range from routing vs. switching to frame relay vs. VPNs to IBM vs. DEC. But I know there must be more to debate around managing today's advanced IP networks.

Can Skype be a good corp. citizen? | Network World

To date, Skype has existed outside of the usual corporate IT structure, offering individual connectivity. But Skype's modus operandus is to "use its users" as relay points - rather than centralized servers. And as soon as the user plugs into the corporate net, that network also becomes a potential Skype resource. As such, Skype needs to do the diligence to become a good citizen on that network.

E-mail and its security discontents | Network World

Jericho Forum member advocates Microsoft, Cisco and others stepping up to help make SMTP-based messaging more secure.

Checking to see if SMTP server is legitimate for a domain | Network World

Is there a mechanism in place to authenticate an SMTP server as an authorized or legitimate sender of e-mail for a domain?

Nortel says it is ‘firmly committed’ to SIP interoperability | Network World

Two weeks ago, one of our subscribers contended that Avaya, Cisco, and Nortel had provided less-than-stellar support for Session Initiation Protocol, or SIP. This week, we’ll wrap up our miniseries about these companies’ support for proprietary voice protocols vs. their support for SIP. Today, we’ll relay Nortel’s prepared statement on its position.

Windows stalked by rogue packets? | Network World

Microsoft's security team is looking into claims that a flaw in Windows XP and Vista could be exploited through the use of "rogue" packets and that any 'Net connected PC could be affected. Sounds scary, but I am sure it's just another day in the Redmond Patch Department. One thing that does scare me, given my "Out of office" message is on this week, is a story about how spammers are using such auto-reply messages as means to relay Spam. Hopefully, I am not inadvertently spamming people while on vacation!

NetFlash: Carriers push users to move off legacy nets | Network World

Frame relay is an immensely popular workhorse technology for the WAN. So why are Sprint and other carriers forcing you to stop using it? Carriers push users to move off legacy nets http://www.networkworld.com/news/2005/062005-legacy-nets.html?net&story=062005-legacy-nets

NetFlash: Carriers push users to move off legacy nets | Network World

Frame relay is an immensely popular workhorse technology for the WAN. So why are Sprint and other carriers forcing you to stop using it? Carriers push users to move off legacy nets http://www.networkworld.com/news/2005/062005-legacy-nets.html?net&story=062005-legacy-nets

SPF: Some Problems to Face but Seems Pretty Fair | Network World

Andrew Rose posted a note in Risks last January alerting readers to a new project called Sender Policy Framework that uses "SPF records" to be published in the domain name system. E-mail sent with fraudulent headers would be identified because the sender would not match an authorized SMTP server registered in the DNS by means of these records.

Users continue march to IP VPNs | Network World

Site-to-site as opposed to remote-access VPNs are on the rise and replacing frame relay and ATM networks in many cases, according to an upcoming report from Forrester Research.

Metro Ethernet services look better bundled | Network World

Anyone who uses a computer, printer, or server knows wireline and wireless Ethernet are the connectivity media of choice. Even in the face of so many options for metro- and wide-area connectivity - like private lines, frame relay, and ATM - Ethernet is finally making successful headway in those areas.   For those unfamiliar with metro Ethernet services, they look remarkably like frame relay with a well-defined user-network interface, a committed information rate, committed burst rates, a means to discard

Visual Networks goes LAN-side | Network World

Over the past several years, we've often discussed the tremendous advantages that using intelligent DSU/CSU products can bring in terms of network optimization. In addition to being a trouble-shooting aid, these products with capability to monitor traffic, have offered significant cost-saving advantages in terms of "right-sizing" your frame relay, IP, and ATM networks.

The evolution of the WAN over the past 10 years | Network World

We forgot to notice a significant milestone a couple of months ago. This newsletter is now over 10 years old. Joanie Wexler and I took over the newsletter in May of 1998, after the prior authors - who shall remain nameless - wrote six newsletters on frame relay and decided that they had nothing else to say.

The evolution of the WAN over the past 10 years | Network World

We forgot to notice a significant milestone a couple of months ago. This newsletter is now over 10 years old. Joanie Wexler and I took over the newsletter in May of 1998, after the prior authors - who shall remain nameless - wrote six newsletters on frame relay and decided that they had nothing else to say.

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