Questions tagged [email]

The server configuration of email, including POP3, SMTP, IMAP, and popular server software packages that control email.

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Out of Office was setup on an email which is now an alias; anyway to remove that out of office?

We have a user who a few months ago went through a process of condensing the multiple email addresses they had (All of which had their own associated mailboxes) into one email address. The past email ...
Tomsta's user avatar
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5 votes
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Is 8bit Content-Transfer-Encoding Considered RFC 5322 Compliant?

What I'm trying to ascertain is whether or not emails containing 8-bit characters (in the range %x80-%xFF) - which could appear in messages or sections with a Content-Transfer-Encoding header of 8bit ...
user1974458's user avatar
2 votes
0 answers
103 views

How to capture incoming emails on exchange before they reach transport agents?

I'm trying to debug why some inbound emails are failing DKIM checks. I'm running the latest version of Microsoft Exchange server 2019 on Widows Server 2022. I have enabled pipeline tracing via the ...
Danny.Ando's user avatar
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0 answers
22 views

DKIM settings with Amazon SES not finding primary domain

I'm attempting to send email via Amazon SES with a custom domain. I have one domain that works and the DKIM headers that come to my gmail account look like: Authentication-Results: mx.google.com; ...
stdunbar's user avatar
  • 186
-1 votes
0 answers
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Expose SMTP server in Windows Server 2019 [closed]

I created a SMTP server using Node with the package smtp-server. When I run telnet localhost 2525 it recognizes a connection. How do I expose it to the public? I'm using Windows Server 2019, with the ...
Jose Carlos Ramírez's user avatar
-2 votes
1 answer
56 views

Google calendar invites shared through our domain's email are getting blocked/sent to spam at recipient end. SPF & DKIM pass but DMARC fails

I have the Google workspace DKIM record copied and set in my dns entry page's DKIM record. I have also enabled the start authentication option on Google workspace. However still the calendar invites ...
Sarthak Awasthi's user avatar
0 votes
2 answers
70 views

How do I cheaply split emails between different servers dependent on the user its sent to?

I'm helping a friend start a small business, he wants an email on his domain ([email protected]) to have access to Google Drive storage to be able to upload files and share them with clients. He also ...
Miles Acq's user avatar
1 vote
1 answer
101 views

Can I have more than one public keys saved in one selector for dkim?

The question is easy to understand, but it might be confusing. I understand that I can host multiple selectors for a DKIM record, but just out of curiosity, can I have multiple keys per selector in a ...
SUNITA GUPTA's user avatar
0 votes
1 answer
40 views

How to send email from smtp server1 to smtp server2 (Postfix) via client?

How to make server1 with postfix can send email to server2 with postfix by redirecting DNS query to it (type forward). These servers are on the same local network. Server1 is to receive a non-...
test1's user avatar
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1 answer
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Is it a good idea to add `calendar-server.bounces.google.com` to my SPF record?

I'm trying to maximize my company's email deliverability and DMARC reports tell me we are failing DMARC SPF alignment with calendar-server.bounces.google.com which I suspect is the email server ...
Juan Pablo Santos's user avatar
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1 answer
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How can I filter incoming email and then forward to another MX server?

Currently, I have an organisation set up in Gmail with a custom domain. I’d like to pre-filter all emails being received at that domain - think a transparent email proxy if you will. My DNS MX is ...
James Hyde's user avatar
-2 votes
0 answers
90 views

Postfix only receiving email [duplicate]

Port 25 is open, I have tried contacting my server from my local through: telnet andrewsXXXX.org (hidden for security reasons): > telnet andrewsXXXX.org 25 Trying 130.162.144.243... Connected to ...
Andrew's user avatar
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0 votes
1 answer
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Weird email spam issue. Google Domain Exchange email server

We have a client who is blocking our email domain. Their IT wrote this to us. I've never seen this be an issue before. You are hosted on Google but have entries referring to Microsoft email protection ...
Phi's user avatar
  • 101
0 votes
2 answers
157 views

Postfix/Dovecot presenting default SSL certificate from Apache to Thunderbird client

I've been struggling with this issue for some time now. I want thunderbird to get the certificate for mail.******.cl, but it always seem to get ******.cl. So I've done a couple of tests, and realized ...
Jairo Alarcón's user avatar
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0 answers
81 views

Using Dovecot on Linux as an email archive repository

I am helping a company who has recently moved from one host to another. The new host has an 4.48gb limit for email which the companies emails fills. They don't want to lose the older emails but they ...
ddkehr's user avatar
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-2 votes
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WebApp Email Failure

We have a web application that is failing to send sending emails automatically when certain events would occur through our OWA address from our exchange mail server using a hardcoded user and port 587....
bShaver's user avatar
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1 answer
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Postfix+Dovecot: emoji in subject from command line break the delivery ("SMTPUTF8 is required, but was not offered"), works from Gmail

Tl;dr: if I send an email to my Postfix+Dovecot server with the subject containing UTF-8 characters email from Gmail => Postfix+Dovecot deliver the email correctly email from mail (command line) =&...
Dr. Gianluigi Zane Zanettini's user avatar
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0 answers
65 views

Mail signature invalid because of encoding of dots in quoted-printable mail

This is a repost so i will link the post: https://security.stackexchange.com/q/274208/227343 I‘m sending a mail encoded with quoted printable encoding that contains some dots „.“. There is a problem ...
Lorem ipsum's user avatar
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0 answers
42 views

Mails invalid signature because of encoding of periods in quoted printable

I‘m sending a mail encoded with quoted printable encoding that contains some dots .. There is a problem with a specific mailserver/customer. For some reason, they receive the mail in such a form that ...
Lorem ipsum's user avatar
-4 votes
1 answer
61 views

How do I view mail (postfix?) configuration settings?

I inherited a server that is mailing status messages via an external mail-server. It runs crontabs that run scripts that send mails. Example (simplified): echo "disk free status 10GB" | ...
TheGlasses's user avatar
0 votes
3 answers
96 views

Exchange Server: Is it possible to find out which user marked an email as read?

We are running a self hosted Exchange 2016 Windows Server 2016 Datacenter. There is a shared mailbox used by multiple users. Users have been told to mark emails in this account only in special cases, ...
Thariama's user avatar
  • 106
0 votes
0 answers
53 views

PHP PEAR Mail STARTTLS failed error 220 with postfix

I'm running postfix with dovecot. I'm trying to use the PHP Pear Mail package to send e-mails, but I can't get it to work. The error I get is this: authentication failure [SMTP: STARTTLS failed (code: ...
Aviation4001's user avatar
0 votes
2 answers
125 views

Why is PTR needed in DNS, instead of using a service record or an MX record?

Why would an organization with an email system have a requirement that a system sending email to it needs a PTR reverse lookup DNS record of the IP address of the sending email server? Can the ...
ARGYROU MINAS's user avatar
-1 votes
1 answer
64 views

Why Google SMTP MTA's are not sending STARTTLS command

I'm a software engineer that wrote my own SMTP delivery agent. I recently added the STARTTLS support to my software and I was doing some testing, when I noticed that Google's SMTP transfer agents are ...
Ronnie Overby's user avatar
0 votes
1 answer
61 views

Emails sent from my server are being flagged by SpamAssassin with the -1.274 RDNS_NONE

I'm experiencing an issue with email delivery where SpamAssassin is flagging my emails with the RDNS_NONE result. I suspect it's due to a mismatch between my Reverse DNS (rDNS) and HELO settings, but ...
Ganja_Sense's user avatar
1 vote
2 answers
123 views

PTR record with multiple sending domains

We have a set up with two dedicated IP addresses that send e-mails from multiple domains. As an example, the dedicated IP addresses are 192.0.2.1 and 192.0.2.2, and the domains are example.com, ...
greymonkey23's user avatar
0 votes
1 answer
105 views

Something sends email to OpenDKIM even after purging it

I can't send email from my server using Postfix. The /var/log/mail.log has: postfix/local[1803]: 59367CDB9: to=<[email protected]>, orig_to=<opendkim>, relay=local, delay=0.03, delays=0....
Mohammed Baashar's user avatar
0 votes
0 answers
42 views

Domain name migration: avoid phishing warnings

I'm migrating email domains, so that all users will change from [email protected] to [email protected] One thing we've discovered while testing is that certain email providers (especially Google) will put ...
domdomegg's user avatar
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1 answer
98 views

Will this work? Adding an alias domain and moving primary domain MX to M365

We have a special extenuating situation. We have a business we've had for 20 years using example1.com and we're being forced by our contract to switch and use M365 encrypted email but the entire ...
hakarune's user avatar
  • 101
0 votes
0 answers
64 views

Incorrect dmarc record landing some mail in spam

I have just received notice from one of our partners that some of our emails sent via AWS SES are being flagged by their email provider as potential spoof DMARC. We used route 53 to add all our DNS ...
red house 87's user avatar
0 votes
1 answer
57 views

what comes first smtpd milters or cleanup in order of filtering in postfix?

Based on the documentation of the postfix (as stated here: 'https://www.postfix.org/SMTPD_PROXY_README.html') the smtpd milters should be used to filter the emails first and then the cleanup service ...
Ayush Gupta's user avatar
0 votes
3 answers
150 views

Will Microsoft 365 fail new Gmail "Email sender guidelines" re: reverse DNS check?

Gmail recently published new "Email sender guidelines" which will be enforced from February 2024. https://support.google.com/mail/answer/81126 In "Requirements for all senders" it ...
Chris's user avatar
  • 103
0 votes
0 answers
80 views

How to send mail using this smtp server?

The SMTP server is set up as this. hasAuthorization: Y username: [email protected] password: mail@password senderEmail: [email protected] properties: mail.smtp.auth: true mail.smtp.host: ...
barnyard9's user avatar
0 votes
0 answers
95 views

Dovecot not receiving mail while making use of vmail

Below is my current vmail configuration. auth_mechanisms = plain login auth_username_format = %n protocols = imap lmtp # Search for valid users in /etc/passwd userdb { driver = passwd ...
root-louis's user avatar
0 votes
1 answer
79 views

postfix sending only short messages ( emails ) but not long messages?

when I am sending a short email from "[email protected]" or any other email acc , the message is received well in the inbox of Gmail , hotmail etc , but if I send the message again with long ...
Khodour.F's user avatar
  • 209
0 votes
0 answers
55 views

Issue with 'delay_reject=no' and smtpd_helo_restrictions in Postfix

In Postfix MTA, I have set helo and client restrictions with the DISCARD policy. But since setting delay_reject=no I am getting this error just after connect from for some clients (don't know if they ...
SUNITA GUPTA's user avatar
0 votes
1 answer
19 views

What is meant by "Message sorting optimization records" in dovecot index?

Dovecot documentation here "https://doc.dovecot.org/developer_manual/design/indexes/index_file_format/#main-index" says that "Message sorting optimization records" are stored in ...
Ayush Gupta's user avatar
0 votes
0 answers
33 views

What is difference between uidvalidity and list index file in dovecot?

Dovecot's document notation says that uid-validity file store IMAP UID to filename mapping but it also says list.index file also store same. If it's so what is need of two files.
SUNITA GUPTA's user avatar
0 votes
1 answer
104 views

In postfix can I mention sender access map in client restriction?

It's a question out of curiosity rather than necessity. What should happen say I place sender access map inside smtpd_client_restrictions and also place client access map in smtpd_sender_restrictions ...
SUNITA GUPTA's user avatar
0 votes
1 answer
62 views

In postfix how parent_domain_matches_subdomains helps rejecting mail for subdomains?

Based on the standard configuration given in https://www.postfix.org/STANDARD_CONFIGURATION_README.html#firewall the parent_domain_matches_subdomains = debug_peer_list, smtpd_access_maps should help ...
SUNITA GUPTA's user avatar
1 vote
1 answer
95 views

How OpenDKIM decides which emails to sign?

In OpenDKIM, what domain does it consider to use when comparing to internal hosts? Do it consider the domain of Return-Path (i.e. envelope MAIL FROM's domain) or header From or HELO's domain.
Ayush Gupta's user avatar
1 vote
1 answer
170 views

Why is it advised to disable relayhost when hosting mail server behind firewall?

I am trying to setup an MTA. While reading documentation I came across "Standard Configuration" for Running Postfix behind a firewall. I am confused on this part: IMPORTANT: do not specify ...
SUNITA GUPTA's user avatar
1 vote
2 answers
44 views

Can I log when the message arrival rate exceeds the message delivery rate in postfix?

I am trying to implement a MTA, on reading documentation of the postfix I found a parameter 'in_flow_delay' whose description in sort says 'Time to pause before accepting a new message, when the ...
Ayush Gupta's user avatar
0 votes
0 answers
39 views

What is behaviour of opendkim while verifying an email with multiple dkim signatures?

I am trying to implement DKIM verification using Opendkim and postfix. The doubt I am struck by is what will happen if the email has more than one DKIM signature and one of them fails (as like failed ...
Ayush Gupta's user avatar
1 vote
0 answers
150 views

What are typically the headers which I should oversign?

I am trying to setup MTA using Postfix and using opendkim for dkim signing. When I went through opemdkim documentation it have a field which is named 'OversignHeaders' document describes it as: "...
Ayush Gupta's user avatar
0 votes
2 answers
109 views

sendmail setup and config

I am trying to figure out how to setup sendmail to allow for mail to be sent between two machines. In my case here's what I did. Installed sendmail commented the line where sendmail was servicing ...
posghetti's user avatar
0 votes
1 answer
112 views

What does "--[no]subdomains" option in opendkim-genkey mean?

Based on the documentation --nosubdomains "Disallows subdomain signing by this key". But didn't we need to create separate DKIM records for subdomains regardless? Please correct me if I am ...
Ayush Gupta's user avatar
4 votes
2 answers
435 views

What is difference between using smtp vs relay transport type in postfix?

I am trying to setup MTA which should submit different intranet mail gateways based on the recipient's domain. For that I thinks transport_maps in postfix should be setup for selective domains; if ...
SUNITA GUPTA's user avatar
2 votes
2 answers
151 views

How to restrict based on combined usage of sender email and client ip address in postfix?

I have a MTA (postfix) with sasl implemented. I want that for a subset of users I can map their email address to a particular range of ips (separate for each email user). If a user tries to send email ...
SUNITA GUPTA's user avatar
-1 votes
1 answer
131 views

How to bypass postfix milters for certain users?

I am trying to set up an incoming MTA server using Postfix. I have specific requirements that some users' emails should not go through the milters. Is there any way this can be done in Postfix? One ...
SUNITA GUPTA's user avatar

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