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April 27, 2021 New version of POPcon online - v4.3

April 11, 2021 New version of POPcon online - v4.0

August 19, 2013 ServerPulse, our new service just released

January 29, 2013 Exchange Connectiontimeout

January 24, 2013 Configure MS Exchange

January 23, 2013 Exchange pop3 setup

January 12, 2013 New product MultiSendcon released

October 19, 2012 Exchange server 2012 configuration

September 14, 2012 Remove whitespace from add/remove programs

September 12, 2012 Exchange 2013 configuration step by step

September 05, 2012 exchange 2010 installation guide

September 01, 2012 pop3 connector christensen software

September 01, 2012 POPcon discount code

August 21, 2012 Configure Microsoft Exchange

April 20, 2012 New version of POPcon online - v3.77

April 19, 2012 ChangeSender v2.92 published

March 23, 2012 POPcon on Windows SERVER 8 Beta?

March 05, 2012 POPcon on Windows 8?

January 28, 2012 ChangeSender v2.90 released

October 07, 2011 ChangeSender release v2.80 automatically changes email signatures

December 15, 2010 ChangeSender press release

December 13, 2010 ChangeSender Demo Video ready

December 04, 2010 ChangeSender v2.50 released

October 09, 2010 New servolutions website design

June 02, 2010 New product released: ChangeSender

December 06, 2009 Company name change: Christensen Software becomes Servolutions

October 27, 2009 New Exchange 2007 configuration guide

September 08, 2008 New version POPcon v3.70 online

April 22, 2005 New version POPcon v3.00 online

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Product: POPcon

Product: POPcon (Lotus Domino version of page)


POP3 server configuration

Exchange Server / SMTP configuration


Internet connection

General configuration options


POPcon / POPcon PRO help file

Version history of POPcon


POPcon Installer


Product: POPcon PRO


POP3 server configuration

Exchange Server / SMTP configuration


Internet connection

Antivirus function

Antispam function

Blacklist servers

Rule-based distribution system


POPcon / POPcon PRO help file

Version history of POPcon


POPcon PRO installer

Product: CSCatchAll

Version history of CSCatchAll


CSCatchAll installer

Product: ChangeSender

Exchange Send-as tool

Version history of ChangeSender


Download the Outlook add-in Install this on each user's system.

Download the server component, Exchange 2000, 2003 version Install this on the Exchange Server (this version for Exchange 2000 or 2003)

Download the server component, Exchange 2007, 2010 version Install this on the Exchange Server (this version for Exchange 2007 or 2010)

POPcon purchase page

PAD-File (XML) of POPcon

PAD-File (XML) of POPcon PRO

PAD-File (XML) of RemoveWhitespaceFromAddRemovePrograms

PAD-File (XML) of POPcon NOTES

Support files

How can I transfer my POPcon configuration settings to my new server without retyping it all?

"530 5.7.1 Client was not authenticated" Error message from Exchange

My Exchange 2007 or 2010 does not accept emails larger than 10MB. What can I do?

"452 4.3.1 Insufficient system resources" error message from Exchange

"550 5.7.1 Unable to relay" error message from Exchange

There are .msg files in the POPcon folder with undistributed emails left after we solved an Exchange problem. How can we redistribute them?

Exchange 2013 SMTP error "451 4.7.0 Temporary server error. Please try again later. PRX"

Emails to recipients that are unknown in my Exchange/ActiveDirectory organization are rejected by my Exchange Server and seem to remain in POPcon's queue.

Does POPcon work with Exchange 2010? 2007? 2003? 2000?  5.5? SBS versions?

The distribution of incoming emails from a mailing list does not work correctly. What can I do?

What do I do if all emails get forwarded to the postmaster because they "do not have local recipients"?

POPcon hangs when my virus scanner deletes infected *.msg files from the POPcon folder!

Can I start the mail retrieval cycle from the command line (.bat, etc.) ?

Why is email to unknown recipients in my domain not forwarded to the postmaster?

POPcon downloads email ok, but can't reach my exchange server - what can I do?

BCC recipients do not receive the email, although recipients listed under TO: and CC: do. Any hints?

How can I get POPcon to not work with my ISA-Server (proxy) ?

What can I do about the error message "Host did not acknowledge DATA command [554. 5.5.2 No valid recipients]"?

POPconAdmin does not work or has problems communicating with my POPcon service?

Will I lose emails if my Exchange Server happens to be down when POPcon tries to send emails there?

Is there a trace of POPcon's actions somewhere so we can check where email messages came from and where they went?

How can I get rid of downloaded emails that are stuck in POPcon's queue?

All emails are suddenly tagged as SPAM after a period of no problems with the antispam feature!

POPcon does not install on my machine. What can I do?

Exchange/SMTP connection was unexpectedly closed or error message "454.5.7.3 Client does not have permission to submit mail to this server."

How can I resend already downloaded messages?

How do I configure Exchange and POPcon if I want to handle only part of a domain?

How can I diagnose malfunctioning antispam blacklist server lookups?

What could be the reason for ''Mail transfer to exchange failed, reason: Connection to host denied'' ?

Exchange does not accept some email from POPcon and keeps saying "550 5.7.1 Requested action not taken: message refused"!

POPcon always forwards my email to TWO Exchange mailboxes: The real recipient and a recipient named like my catch-all mailbox at the ISP. How do I stop that?

POPcon says that it drops copies of downloaded email - what causes this message?

What can I do when exchange does not accept some emails and comes up with an error message: "550.5.5.1 user unknown" or "503.5.5.2 need Rcpt command" ?

The new version 3.20 of POPcon can download IMAP email. Can it download email from AOL accounts with this?

Can I use POPcon to download email from Gmail accounts?

"Out of Office" messages are returned to internal users but not external users on the internet. Is this a problem of POPcon?

Why does POPcon need to know the "accepted domains" on the POP3/IMAP config tab?

How do I configure CSCatchAll? The Administrator utility only allows me to enter a license code.

How can I enable non-delivery reports (NDRs) to external mail senders in Exchange 2003?

Mail does not reach mail-enabled public folders. What could be the reason?

Does POPcon also work with Lotus Domino Server?

Only messages less than 10MB in size seem to come through, does POPcon impose a size limit?

Windows Data Execution Prevention is stopping or crashing the POPcon antivirus engine. What can I do?

Exchange does not accept any email from POPcon. Error message: "530 5.7.0 Must  issue a STARTTLS command first"

I installed CSCatchAll and configured a catch-all account but it does not seem to work at all! What can I check?

Why is the spam checking taking so long? It takes 30 seconds for a single message!

What does the error message "[blacklist] could not be tested and will not be used" mean?

Mails to mail-enabled public folders end up as posts instead of as emails. Can that be changed?

How does the POPcon PRO antispam feature work / why is it not 100% accurate?

What is the shortest mail download interval supported by POPcon

POPcon moved emails in the TOOLARGE or BADMAIL folders. How can I resend them to Exchange?

What does a "421 4.4.1 Connection timed out" Exchange 2007 SMTP error message mean?

My Exchange 2007 only accepts one or a few messages at a time from POPcon. How can I increase the number?

Error message "Exchange aborted receiving the message after 2xxxx bytes." - what to do?

ChangeSender installed correctly but the sender address appears unchanged

How can I restrict my users choices for the Send-As address?

Why doesn’t my new distribution group accept emails from outside?

How can I use the same sender address for two Exchange mailboxes?

I want POPcon to forward some accounts to a non-local mailbox on the internet but that does not work. How can I do this?

How can I disable the Add-in for all users by default?

"552 5.3.4. Header size execeeds fixed maximum size" error message from Exchange

How can I have non-delivery reports (NDRs) sent for unknown users?

"421 4.4.2 Message submission rate for this client has exceeded the configured limit" error message from Exchange

I need to have non-delivery reports (NDRs) sent for emails that are too large instead of moving them into the TOOLARGE folder

504 5.7.4 Unrecognized authentication type - error when using Office 365 smtp relay

Mail transfer to Exchange failed, reason: Could not reach Exchange SMTP server - check IP port 25 is not blocked

How to protect Wordpress sites with BotFence

"530 SMTP authentication is required" what does it mean?

IONOS blocks non-delivery reports and out-of-office messages

FAQ as RSS feed

Knowledge Base