Solved

SMTP Troubleshooting

Posted on 2004-09-20
1
240 Views
Last Modified: 2006-11-17
Getting the following "550 #5.1.0 Address rejected" randomly for addressees that work (send once successfully and later the previous message).  The ISP is Charter and I believe the problem is their's, but don't know how to go about verifying why/how the rejection is occurring.
0
Comment
Question by:mm70190
1 Comment
 
LVL 104

Accepted Solution

by:
Sembee earned 125 total points
ID: 12105844
Probably reverse DNS or a blacklist. Have you checked both of those?

Simon.
0

Featured Post

Top 6 Sources for Identifying Threat Actor TTPs

Understanding your enemy is essential. These six sources will help you identify the most popular threat actor tactics, techniques, and procedures (TTPs).

Join & Write a Comment

Disabling the Directory Sync Service Account in Office 365 will stop directory synchronization from working.
ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.
In this video we show how to create a Contact in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Recipients >> Contact ta…
To show how to create a transport rule in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Rules tab.:  To cr…

758 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now