Knowledgebase : Inbound Mail Flow
Acceptable Use Policy for Inbound and Outbound Email
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/Other_Features/Acceptable_Use_Policy_for_Inbound_and_Outbound_Email
How to tune Proofpoint Essentials' Spam detection
The Proofpoint Essentials default Spam settings should be suitable for most situations, but there are cases where some manual influence can help the system in making better decisions.  For example, marketing newsletters can be problematic in that the engi...
What is the difference between Spam and Opt-in Email?
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/What_is_the_difference_between_Spam_and_Opt-in_Email%3F?mt-draft=true
'552 5.3.4 Message size exceeds fixed maximum message’ even thoug...
This article has been migrated to our Help System HELP SYSTEM URL:  https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/'552_5.3.4_Message_size_exceeds_fixed_maximum_message%E2%80%99_even_though_Email_size_is_less_than_max_rec...
[Setup Step 4]: Instructions for changing MX records
Redirecting customers MX records to point towards Proofpoint Essentials is crucial to the successful deployment of the solution and ensures all email is both filtered and delivered. Since we cannot do this for you, it will be necessary to contact your ho...
554 5.7.1: Relay access denied
This article has been migrated to our Help System HELP SYSTEM URL:  https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/040_usersandgroups/Outbound_mail_rejected_-_554_5.7.1%3A_Relay_access_denied
Adding MailChimp IPs to your Safe Sender List (Converting larger ...
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/090_filtersandsenderlists/How_to_Add_MailChimp's_IPs_to_your_Safe_Sender_List
Anti-Spoofing Tool for Essentials
This article has been migrated to our Help System Help System URL: https://help.proofpoint.com/Proofpoint_Essentials/user_topics/040_spamsettings/Anti-Spoofing_Tool_for_Essentials?mt-draft=true
Attachment Types Blocked by Default
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/090_filtersandsenderlists/Attachment_Types_Proofpoint_Essentials_Blocks_By_Default
Basic Troubleshooting of Mail Flow Issues
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/Troubleshooting_Mail_Flow_Issues
Bounces and Deferrals
This article has been migrated to our Help System HELP SYSTEM URL:  https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/Bounces_and_Deferrals
Changing Filtering Service to Proofpoint Essentials
When moving from one filtering service to another, or setting up for the first time, there are steps to include when setting up Proofpoint Essentials that may be forgotten outside of our standard steps. Remember to add in our IP ranges [http://support.p...
Customer suddenly started receiving an inordinate amount of unwan...
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/Other_Features/Users_bombarded_with_unsolicited_email_as_result_of_email_bomb
Does Proofpoint Essentials limit email attachment sizes?
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/Proofpoint_Essentials_Attachment_Size_Limits
Email bounces with the message 'Address lookup failed'
This error occurs when the customer in question has the 'Enable email relay' option switched on and someone tries to send email to a recipient address that is not registered with Proofpoint Essentials AND the recipient domain is configured in Proofpoint E...
Email Spoofing
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Email_Spoofing
Emails are not being received after setting up an organisation on...
Once an account is completely setup on Proofpoint Essentials User Interface according to the getting started guide found, the partners/customers should wait until the top of the 30 minutes for the changes to update across Proofpoint Essentials Network bef...
Emails not received from a Website contact form
This article has been migrated to our Help System HELP SYSTEM URL:  https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/hostedemailservices/You_Are_Not_Receiving_Emails_from_a_Website_Contact_Form#How_to_resolve
Error Codes
This article has been migrated to our Help System. HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/Common_Error_Codes_found_in_Message_Details [https://help.proofpoint.com/Proofpoint_Essentials/Administrat...
Filter: Quarantine encrypted attachments
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/Other_Features/How_to_quarantine_encrypted_attachments
Functional account not receiving Emails
This article has been migrated to our Help System HELP SYSTEM URL:  https://help.proofpoint.com/Proofpoint_Essentials/Functional_Accounts_Not_Receiving_Emails
Google Apps email being caught as spoof
This article has been migrated to... https://help.proofpoint.com/Proofpoint_Essentials/user_topics/040_spamsettings/Google_Apps_email_being_caught_as_spoof
How is my organization impacted during Proofpoint Essentials main...
In addition to our monthly release schedule, Proofpoint is continuously enhancing the Essentials infrastructure for our customers. Maintenance windows are posted on our support site https://support.proofpointessentials.com [https://support.proofpointessen...
How TLS Delivery occurs
This article has been migrated to our Help System HELP SYSTEM URL:  https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/How_TLS_Delivery_Occurs
How to configure inbound relaying on Office 365 (Deprecated)
This article has been updated and migrated into a new article on our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/hostedemailservices/Configuring_Office_365_for_Proofpoint_Essentials [https://help.pr...
How to report a general problem with an email
NOTE: This knowledgebase does not address misclassifications (i.e. Spam that got through or desired email that got caught) as there is a separate knowledgebase article for that. The Proofpoint Essentials Support Team will need specific details in order ...
How To View Email Header In Outlook
This article has been migrated to our Help System Help System URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/How_To_View_Outlook_Email_Header?mt-draft=true
Inbound / Outbound UI Stats for Users
This article has been migrated to... https://help.proofpoint.com/Proofpoint_Essentials/user_topics/040_spamsettings/Inbound_%2F%2F_Outbound_UI_Stats_for_Users
Inbound Email: Not receiving emails from particular senders or se...
If Proofpoint Essentials users are unable to receive email from certain email addresses, it is most likely an issue with the sending mail server. However there are a few possible areas where this may be a configuration issue on the Proofpoint Essentials p...
Inbound sender DNS check option
The Inbound sender DNS check option provides an additional layer of protection against spam and helps ensure that inbound messages that might not have a destination to bounce to are not allowed in. The proper step to address this is to get the sender to p...
Issues with web forms and auto generated emails not being receive...
WEB FORM MESSAGES NOT RECEIVED We have frequent issues with web form messages not coming into the Proofpoint Essentials service. One of the key statements is: "This works to any other recipient, just not my domain name." We ask that you check these ...
Limits for sending and receiving email
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/Other_Features/Inbound_and_Outbound_Email_Limits/Common_errors_related_to_limits_for_sending_and_receiving_email
Options for handling Bulk Mail
WHAT IS BULK EMAIL? Email that is sent to a large list of recipients who have either directly or passively agreed to receive communications from the sender or senders. Proofpoint Essentials does not ordinarily quarantine legitimate bulk-email. In some c...
Proofpoint Essentials Email Management Service
WHAT IS PROOFPOINT ESSENTIALS EMAIL MANAGEMENT PLATFORM? The service accepts and processes mail on behalf of its' subscribing customers. It passes safe traffic on and captures viruses, spam or any malicious content based on the unique set preferences of...
Providing Internet headers from an email message
How do I retrieve internet headers from an email message? The following steps below explain how to provide the Support Team with email headers MICROSOFT OUTLOOK 2010 AND 2013 1.    DOUBLE CLICK the message to open it in a new window 2.    Click File ...
Quarantining suspected spoof or imposter emails
This article has been migrated to our Help System HELP SYSTEM URL:  https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/Other_Features/Quarantining_suspected_spoof
Reading Email Message Headers Using Header Analyzer Tools
MICROSOFT REMOTE CONNECTIVITY ANALYZER The Microsoft Remote Connectivity Analyzer [https://testconnectivity.microsoft.com/] includes a Message Analyzer tool. Paste the message headers into the field provided and click ANALYZE HEADERS to produce the repor...
Reasons why the 'easy-spam-disclaimer footer' is not added to som...
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Knowledge_Base/Anti_Spam_and_Anti_Virus/Easy-spam-disclaimer_not_being_added
Reporting an email problem
This article has been migrated to our Help System HELP SYSTEM URL:https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/Other_Features/Reporting_an_email_problem_to_Proofpoint_Support
Requesting assistance from Support to investigate an email proble...
Reporting an email problem to Proofpoint Essentials Support requires a few pieces of information that will assist us in narrowing down and investigating the issue, or even just for us to make useful suggestions. NOTE: if this problem is regarding a misc...
Sender Lists - Safe and Block
This article has been migrated to our Help System HELP SYSTEM URL:  https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/090_filtersandsenderlists/Setting_up_sender_lists/How_to_edit_Safe_and_Blocked_Sender_Lists
Spam email still gets through to users
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/user_topics/040_spamsettings/Spam_email_still_delivered_to_users
SPF Check on Essentials for inbound mail
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/SPF_Check_on_Essentials_for_inbound_mail  
Spooling Alerts
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/Alerts/spoolingalerts/Understanding_and_Setting_Up_Spooling_Alerts
UI Logs say “Delivered” but email is not in my Inbox
This article has been migrated to our Help System Help System URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/Logs_say_%22Delivered%22_but_email_has_not_reached_recipient's_mailbox?mt-draft=true
Understanding Message Header Information
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/110_logs/Understanding_Message_Header_Information
Understanding Proofpoint Essential's Mail Flow
This article has been migrated to our Help System HELP SYSTEM URL:  https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/000_gettingstarted/Understanding_Proofpoint_Essential's_Mail_Flow
User email address is "marked as invalid"
This article has been migrated to our Help System Help System URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/040_usersandgroups/User_email_address_is_%22marked_as_invalid%22?mt-draft=true
Using Proofpoint Essentials together with POP or IMAP
Proofpoint Essentials filters email for viruses and spam, along with some admin/user defined rules. The service is cloud based (no on premise hardware) and acts as a go-between the internet and your mail server. This is accomplished by modifying the mail ...
Why aren't my users receiving a Welcome email?
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/020_account/Why_aren't_my_users_receiving_a_Welcome_email%3F
Why is SPF check failing with Office 365
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Administrator_Topics/hostedemailservices/Why_is_SPF_check_failing_with_Office_365 [https://help.proofpoint.com/Proofpoint_Essentials/Adm...
Winmail.dat file received – Unable to open
This article has been migrated to our Help System HELP SYSTEM URL: https://help.proofpoint.com/Proofpoint_Essentials/Preventing_WINMAIL.DAT_attachments https://help.proofpoint.com/Proofpoint_Essentials/Preventing_WINMAIL.DAT_attachments