Email errors can be really bothersome – they can hit you hard and unexpected, when you attempt to send an urgent mail.
eMail server security Blogs
Spam! We all hate it.
And that is why people have invented a gazillion ways to fight it.
Anti-spam systems range from SPF & RFC checks to Sender verification & Mail queue cleaners. (more…)
Spam mails are more than a mere nuisance for web hosts. When a server is spammed, valid mails get lost or delayed indefinitely in the pool of spam mails.
Equally panicky situation is outbound spamming from your server. Your mail server IP can easily get blacklisted, causing email delivery failures for your customers.
Getting listed in a spam blacklist is a dreadful experience for server owners. Users end up facing email delivery failures and bounces, which can take your business reputation for a toss.
As a security measure, mail from blacklisted IPs are rejected by most mail servers. So, if you want uninterrupted mail services, you’ll need to stay clear of blacklists.
In our role as Outsourced server support specialists for web hosts, we secure and maintain the servers from attacks and viruses. There are several tools that come in handy, for securing various services.
ClamAV is an open source email scanning program that has an antivirus engine for detecting trojans, viruses, malware & other malicious threats in emails. ClamAV is usually integrated along with popular mail servers such as Exim.
cPanel/WHM is the most commonly used control panel in hosting industry. In our role as outsourced hosting support specialists for web hosting companies, we resolve many errors related to the control panels.
Using the WHM, it is easy manage various services in the server, but there are many situations where these features fail or give errors, and expert intervention is required. (more…)
Protecting mail servers from being used as Linux SMTP open relays, is a major security task we perform as a part of our Dedicated Tech Support services for web hosting providers.
An open mail relay is an SMTP server that allows any host to send mails through it. If it is open relay, users can send mails through that Linux SMTP relay server without authenticating.
Often web hosts get contacted by account owners who are unable to send or receive emails via Outlook. The error message they see in their Outlook would be:
Task 'firstname.lastname@example.org - Sending' reported error (0x80042109) : "Outlook cannot connect to your outgoing (SMTP) e-mail server. If you continue to receive this message, contact your server administrator or internet service provider (ISP)."
454 4.7.1 <email@example.com>: Relay access denied
This is a commonly seen email failure error by web hosts, website owners and server owners who run Postfix mail server. 454 error usually happens while sending to and receiving from external domains.
In our role as Hosting Support Engineers for web hosting companies, we handle many such mail errors and fix them. Here, we’ll see what causes “454 4.7.1 Relay access denied” error and how we fix it. (more…)