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23
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6answers
34k views

How to send emails and avoid them being classified as spam

This is a canonical question about how to handle email sent from your server being misclassified as spam. For additional information you may find these similar questions helpful: Best ...
20
votes
4answers
3k views

Best Practices for preventing you from looking like a spammer [duplicate]

I'd like to feel more confident setting up mail for my clients with regards to false positives. Here's what I know: SPF records are good, but not every spam filter service/software (SFSS) uses ...
4
votes
2answers
1k views

Barracuda tagging email with 'date grossly in the future.'

I have a Barracuda 300. Granted it's running on some old firmware and the Energize updates are quite outdated. I'd like to update them, but, not my financial decision to do so. Starting around the ...
2
votes
1answer
2k views

Is there any way to see why Outlook's client junk mail filter is marking a message as spam?

I have some users running Outlook 2007 connected to an Exchange server, and they're complaining about mail ending up in their junk box. There's no X-SCL tag in the mail headers so this filtering must ...
0
votes
5answers
2k views

Barracuda spam filter alternative - virtualization/appliance friendly?

I've sold and deployed Barracuda spam and web filters for years. I've always thought that the functionality was good (Barracuda Central, easy interface, effective filtering), but the hardware on the ...
2
votes
5answers
4k views

Open Source or lower-cost alternatives to Barracuda Spam Filter

I'm aware of SpamAssassin-based solutions, but I'm looking for a free or low(er) cost spam filtering solution that's similar in functionality to the Barracuda Spam Filter. The Barracuda works well, ...
2
votes
4answers
208 views

Does sending e-mail in the name of customers increase the risk of being marked as spammer?

We are developing a SaaS website application that lets users send invoices to their clients. Ideally, these e-mails should appear to be originating from our customers, so the sender e-mail address ...
2
votes
2answers
172 views

Best techniques to make sure that emails are not marked as spam

We have a service that requires a registration and the registration process sends some confirmation emails. These emails say in a three-line message that you have to click some link with a generated ...
0
votes
2answers
1k views

Can IIS automatically block IPs based on certain queries?

Can IIS7 automatically block IP addresses if certain queries are tried against my server? Like, is it smart enough to figure out that it's getting spammed by similar requests from the same IP under a ...