Home Products Downloads News Store Support Forums

MaxBulk Mailer | Frequently Asked Questions

MaxBulk Mailer

Frequently Asked Questions

Compatible with MS Windows Compatible with MacOS


SMTP Server Response Codes

SMTP servers use to respond to commands using a defined set of codes. This page is a small guide to the codes mail servers may produce when you try to send mail along with their meanings. They are part of the SMTP protocol (the set of rules used to send emails).

The Meaning of the Codes
A mail server will reply to every request a client (such as MaxBulk Mailer) makes with a return code. This code consists of three numbers.

New paragraph The first generally tells whether the server accepted the command and if it could handle it. The five possible values are:

1: The server has accepted the command, but does not yet take action. A confirmation message is required.

2: The server has completed the task successfully.

3: The server has understood the request, but requires further information to complete it.

4: The server has encountered a temporary failure. If the command is repeated without any change, it might be completed.

5: The server has encountered an error.

New paragraph The second number gives more information. Its six possible values are:

0: A syntax error has occured.

1: Indicates a informational reply, for example to a HELP request.

2: Refers to the connection status.

3 and 4 are unspecified.

5: Refers to the status of the mail system as a whole and the mail server in particular.

New paragraph The last number is even more specific and shows more graduations of the mail transfer status.

This leads us to the detailed list of ESMTP server response codes, as layed down in RFC 821 and later extensions.

Code Description
211 System status, or system help reply.
214 Help message (for a human reader follows).
220 SMTP Service ready (or Ready to start TLS).
221 SMTP Service closing transmission channel.
250 OK, queuing for node node started. Requested mail action okay, completed (Requested action taken and completed).
251 OK, no messages waiting for node node. User not local, will forward to forwardpath (The recipient is not local to the server, but the server will accept and forward the message).
252 Cannot VRFY user (e.g., info is not local), but will take message for this user and attempt delivery (The recipient cannot be verified, but the server accepts the message and to attempt delivery).
253 OK, messages pending messages for node node started.
354 Start mail input; end with <CRLF>.<CRLF>. This indicates that the server is ready to accept the message itself (after you have told the server who the message is from and who you want it to be sent to).
355 Octet-offset is the transaction offset.
421 Domain service not available, closing transmission channel (The service is not available and the connection will be closed).
432 A password transition is needed.
450 Requested mail action not taken: mailbox unavailable.
ATRN request refused (The requested command failed because the user's mailbox was unavailable, for example because it was locked).
451 Requested action aborted: local error in processing. Unable to process ATRN request now (The command has been aborted due to a server error. Not your fault. Maybe let the admin know).
452 Requested action not taken: insufficient system storage (The command has been aborted because the server has insufficient system storage, it happens sometimes when sending to a lot of recipients in Bcc mode).
453 You have no mail.
454 TLS not available due to temporary reason.
Encryption required for requested authentication mechanism.
458 Unable to queue messages for node node.
459 Node node not allowed: reason.
500 Command not recognized: command. Syntax error (The server could not recognize the command due to a syntax error).
501 Syntax error, no parameters allowed (A syntax error was encountered in command arguments).
502 Command not implemented (This command is not implemented).
503 Bad sequence of commands (The server has encountered a bad sequence of commands).
504 Command parameter not implemented (A command parameter is not implemented).
505 Authentication required
521 Machine does not accept mail.
530 Must issue a STARTTLS command first.
Encryption required for requested authentication mechanism.
534 Authentication mechanism is too weak.
538 Encryption required for requested authentication mechanism.
550 Requested action not taken: mailbox unavailable (The requested command failed because the user's mailbox was unavailable, for example because it was not found, or because the command was rejected for policy reasons).
551 User not local; please try forwardpath (The recipient is not local to the server. The server then gives a forward address to try).
552 Requested mail action aborted: exceeded storage allocation (The action was aborted due to exceeded storage allocation).
553 Requested action not taken: mailbox name not allowed (The command was aborted because the mailbox name is invalid).
554 Transaction failed.
571 No external routing allowed, remote sending only allowed with authentication (Illegal relay, missing authentication, RBL/blacklisting)
572 Bounces are blocked due to system abuse by spammers

Blue rows correspond to successfull responses.
Rose rows correspond to delivery errors
Red rows corresppond to server errors.



 Rate This Page!
Stan Busk Stan Busk
May 20, 2019



Recent questions from our MaxBulk Mailer users
Amazon SES (correct) settings New
Picture with text on the right New
Not recieving the Delivery Report New
I've tried to download the latest version for 3 days... New
MLM Unsubscribe feature New
Spaces disappearing when using the Styled Text format New
Email editor and responsive emails New
Text disappearing when previewing and sending New
BCC sending mail merge email Update
Question about your software Update
Accessing the MaxBulk Mailer black list Update
Erreur #103: Le URL n'est pas valide Update
Maxbulk - switching computers Update
Unable to import my contacts into MaxBulk Mailer Update
Setting DKIM for the first time Update
MLM Unsubscribe Link Update
Authentication errors... Update
Importing a csv/txt file
Importing recipients from a text file
TLS1.2 support
Upgrading 8.5 to 8.6
Unexpected Blacklisting
Comcast residential bulk limits
HostGator delivery limits
Someone using your software is sending SPAM
Mise à jour vers 8.6.1
Error in the installation 'api-ms-win-crt-heap-l1-1-0.dll is missing
Lately all my emails are going into the recipients spam folder
Resend Registration Licenses
Mail-merge sender data using tags
How to embed a photo into the email text
Messages says delivered but I haven't received it
Lost emails
Custom Attachments
TLS 1.2 Support
Upgrade MaxBulk Mailer SE to Pro
I purchased the product and did not receive the serial number
Can't send emails thru Gmail
Where are the delivery logs?
Most of my messages are rejected
Earthlink changed settings and MailBulk Mailer does not work
No consigo que envíe mails. SSL
Sending to a maximum of 300 e-mails per hour
My customers are not receiving my messages
Last update broke everything...
Recuperar Maxbulk Mailer SE
MaxBulk Mailer no longer sending links
Someone is illegally using your software with my email address.
MaxBulk Mailer SE
Custom Max Bulk / Adding new features
Someone is spoofing my email address to send spam
How can I use my update plan on a new computer?
Why do I get a Delivery Report message after each delivery?
What mail server can I use with MaxBulk Mailer?
Subject Command Tag
PDF attachments not received
Remote lists
Déplacement/copie de contacts entre documents
MLM upload gives 0 address(es) have been uploaded to 'List'
Where to find the log files of Maxprog Bulk Mailer
Exporting data does not include past sent information
Unsubscribe with text file does not update remote list
Max Bulk Mailer crashes every time after send 100-150 emails
Can't find my activation key
Authentication failed / Relaying error
How do I turn of Click Tracking ? in Plain Text?
Computer crashed, trying to rebuild mailing lists and preferences
MLM URLs don't work
Creating a remote list
Your Kind Assistance Please!
Word docs with weblinks
La page web reçue est différente de celle envoyée avec mbm
Erreur de n° de série
The software asks for an account ID and password
Forwarding emails sent by MaxBulk, cut and paste not working
MLM cannot connect
Resend/Recall Function
Where are the logs?
Won't send any emails
My computer rebooted and i lost my serial number
Transferring recipient lists between two MaxBulk Mailer copies
Links not working
Je n'arrive pas à envoyer mon message à toute ma liste en une fois
Quels sont mes identifiants MLM?
DMARC Evaluation error
Where are the preferences and the lists stored on Windows?
Web Page format doesn't work for me
Upgrade to the App Store app?
List of attachments in the Preview panel
How do I get a picture to be displayed on the top of the message?
Recipients are no longer organized alphabetically
I would like to know if MaxBulk Mailer can personalize emails?
Chinese characters and trial version footer issues
How can I upgrade the App Store version to last available on maxprog?
Unified Email server
I'm receiving lots of 'Undelivered Mail Returned to Sender' bounces
Connection problem with Apple iCloud server
Free upgrade, or not free?
I can't send a PDF attached to my message when it contains pictures
Problem applying styles to a conditional statement result
Any MaxBulk Mailer tutorial to get started?
How to upgrade from Standard to Pro
License Key Recovery
Cannot install the last update
MaxBulk Mailer sent all the messages to me rather than the recipients
Erreur d'authentification du serveur Gmail
Does MaxBulk Mailer come with its own internal SMTP server?
Pièces jointes
How I can change the old activation key with the new one?
Adding Hyperlinks to MaxBulk Mailer messages
Emails not received despite MaxBulk Mailer delivery confirmation
Any dedicated bulk mail server I can use with MaxBulk Mailer?
Can I pay with Bitcoins?
Adding an Unsubscribe link to messages
Your document is set to ISO-8859-1 but your HTML code use UTF-8
Updates for AppStore Version
Adding a URL to an image and placing pictures side by side
How to configure office 365 of microsoft

Generic questions
New paragraph
How do I install Maxprog software on my computer?
macOS
MS Windows
New paragraph
How can I change an application language?
macOS
MS Windows
New paragraph
How to register the software I've just purchased?
macOS
MS Windows
New paragraph
How can I recover the serials I have lost of products I purchased here?
macOS
MS Windows
New paragraph
How can I recover my serial from a registered application?
macOS
MS Windows
New paragraph
How can I find out the product name and version my serial unlocks?
macOS
MS Windows
New paragraph
Where can I read your software License Agreement?
macOS
MS Windows
New paragraph
The software doesn't start, runs very slowly or crashes often, how comes?
macOS
MS Windows
New paragraph
Double-clicking on my files no longer opens them with the software, why?
macOS
MS Windows
Stan Busk If you want to make the most of the software that you have acquired at Maxprog, do not miss the Stan's Blog. It is a library of Tutorials and Tips covering specific features and tipical problems you may have when using our tools. This page is updated regularly depending on the topics discussed in our public forums and issues reported thru our HelpDesk. If you are interested on what we are currently working on (or want to participate in beta testings) don't miss the Stan's Logbook.
For years, MAX Programming has provided companies around the globe with sophisticated and innovative solutions. Our commitment to quality is not only evident in our products, but also in our people. It is our mission in Professional Support Services to ensure that our products perform to the fullest of their ability in order to meet the business objectives of our customers. We provide the tools and information required for improved productivity. To accomplish this, we offer an array of services including: Technical Support, Education Services and Consulting Services.

Maxprog is part of an internet site network made of desktoolset.com, emaildesignstudio.com, familycash.com, icash.promo, maxbulkmailer.com, maxprog.com, maxprog.net, maxprog.org, maxprog.us, myrecipients.com, newslettercomposer.com, sharedcontents.com, stanbusk.com, stanbusk.pairserver.com, usertools.com.
MaxBulk Mailer is a full-featured and easy-to-use bulk mailer and mail-merge software for macOS and Windows that allows you to send out customized press releases, prices lists, newsletters and any kind of text or HTML documents to your customers or contacts.

MaxBulk Mailer is fast, fully customizable and very easy to use. MaxBulk Mailer handles plain text, HTML and rich text documents and gives full support for attachments. With MaxBulk Mailer you will create, manage and send your own powerful, personalized marketing message to your customers and potential customers.

Thanks to its advanced mail-merge and conditional functions you can send highly customized messages and get the best results of your campaigns. You also have support for international characters, a straightforward account manager with support for all type of authentication schemes including SSL, a complete and versatile list manager, support for importation from a wide range of sources including from remote mySQL and postgreSQL databases.

MaxBulk Mailer is a software tool that you purchase once, no need to pay on a per-email basis to submission services!



 !  YES! You can add Anonymous comments! They are moderated though. In order to add a comment without moderation just log in using your Google, Twitter, GitHub, GitLab or Commento login data.



Home Products Downloads News Store Support Forums