**Unless you and your client are actually testing for a specific certificate, man-in-the-middle can still happen **Spam comes via encrypted connections very often (ever get spam from a gmail or account - that will have arrived via an encrypted connection) I'm really struggling to see the use case. They put their own certificate in the middle to decrypt, then re-encrypt mail connections. Most client level antivirus that inspect SSL mail do exactly a man-in-the-middle attack. Man in the middle can happen because the certificates aren't validated Which looks to me like the postfix documentation you linked STARTTLS is susceptible to Man-in-the-Middle attacks, as the exchange about the availability of encryption is not encrypted. In the Ports section of the GUI, just set all standards ports to 'require TLS' Which just made me think that solution does not enforce encryption for outgoing mail, only for incoming mail: This customer will need a dedicated hMailserver** Set a port to 'require StartTLS' or to 'SSL', and ONLY encrypted incoming connections matching that encryption level will be usedįor outgoing setting a route to the appropriate encryption level will work If there was an IP range option "Require SSL/TLS for all connections", this would be a viable solution They don't AUTHenticate, but they do encrypt the connection Many messages are sent to my server via an encrypted connection from people / servers that I don't know (including much SPAM). You do understand that encryption is NOT the same as AUTHentication. "External to local e-mail-addresses") cannot require authentication, since external mail servers don't have credentials.
If you don't have a dedicated hmailserver** for this customer, how will you know which connections to encrypt and which ones to allow unencryptedĪn IP range with "Require SSL/TLS for authentication" would not cover our case, because connections between mail servers (i.e. Like this we could create a dedicated "TLS only" email address. To avoid missing mail by other customers, we would prefer to "require TLS" on the mailbox level. Basically, all mails of all communication partners are encrypted via a Forced TLS connection.ĭoes hMailServer support this? And if not, how much would it cost to sponsor this feature? If a connection fails due to an error situation, the mail transport is rejected and the sender of the e-mail receives a Non Delivery Report (NDR). Forced TLS connection emails will encrypted mails in all cases between transmission of communication partners. The encryption takes place between the Internet access points of the two communicating companies and is automatically carried out without any actions by the communicating communication partners (users). hMailServer should only accept email from/send email to another mail server if the connection is encrypted, and trigger a Non-Delivery Report otherwise:Įncrypting mail transmission via Forced TLS (Transport Layer Security) Transport Layer Security encrypts the transmission of e-mail over the internet. I assume it has to be an issue with Gmail and the other big email services, because it delivers to a Temp Mail inbox without any issues, even with GoDaddy's SMTP relayer configured.A new customer requires us to set up "Forced TLS", i.e. If I try using the GoDaddy SMTP relayer "" at port 25, my emails just get lost and are never received on my Gmail account. Please use the SMTP relay at yourĥ50-5.7.1 service provider instead. Remote server replied: 550-5.7.1 The IP you're using to send mail is not authorized toĥ50-5.7.1 send email directly to our servers. If I try to send an email to my Gmail account, I get the following error:Įrror Type: SMTP Remote server (173.194.204.26) issued an error. A test from port25 shows that SPF check passed, "iprev" check passed, and DKIM check passed. DNS server through GoDaddy is configured, and SPF/DKIM is configured. Port forwarding is configured, checked, and working.
I've set everything up with hmailserver/outlook. I'm at a standstill, maybe someone can help. What Is SelfHosted, As it pertains to this subreddit? Also include hints and tips for less technical readers. We welcome posts that include suggestions for good self-hosted alternatives to popular online services, how they are better, or how they give back control of your data. Service: Blogger - Alternative: WordPress Service: Google Reader - Alternative: Tiny Tiny RSS Service: Dropbox - Alternative: Nextcloud While you're here, please Read This FirstĪnd why not Visit the Official Wiki Github?Ī place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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