FAQ tagged as:

mail server

SPAMHAUS BLOCKLIST ADDRESS IS WRONG MUST FIX Error and Solution

by Vivek Gite · 1 comment

I‘ve configured RBL for my postfix based mail server and I’m getting an error that read as follows:

May 3 04:35:37 mx02 postfix/smtpd[10956]: NOQUEUE: reject: RCPT from ant251.neoplus.adsl.tpnet.pl[83.26.101.251]: 554 5.7.1 Service unavailable; Client host [83.26.101.251] blocked using xen.spamhaus.org; SPAMHAUS BLOCKLIST ADDRESS IS WRONG MUST FIX; from= to= proto=ESMTP helo=

How do I fix this problem?

{ 1 comment }

What is the difference between authentication and authorization?

by Vivek Gite · 2 comments

What is the difference between authentication and authorization? Why it is important to understand difference between two?

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Postfix Configure Multiple ISP Client SMTP Authentication

by Vivek Gite · 4 comments

How do I support multiple ISP accounts in the Postfix SMTP client (smarthost) for relaying email? For example:

[a] user1@isp1.com must be relay via smtp.isp1.com.
[b] user1@isp2.com must be relay via smtp.isp2.com.
[c] me@mycorp.com must relay all my default email via smtp.mycorp.com.

{ 4 comments }

Postfix Configure Client SMTP Authentication ( Smarthost Authentication )

by Vivek Gite · 9 comments

My ISP requires that mail from my dynamic IP to our small business email addresses uses their outgoing SMTP servers. This is probably done to reduce abuse and spam but now I’m not able to send email and local Postfix log file displays authentication failure message. How do I relay mail through my mail ISP servers using Postfix SMTP under Linux / UNIX like operating systems?

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FreeBSD Install FuzzyOCR To Detect Image Spam

by Vivek Gite · 3 comments

Q. How do I install FuzzyOcr plugin for SpamAssassin to detect unsolicited bulk mail (Spam) containing images as the main content for Postfix mail server?

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