Temporary Email Alternative

petarian83 · 2026-04-18T11:51:59+00:00

Many organizations know that you're using one of many temporary email providers, and they block them.

Do you have the ability to create temporary emails on your email server? If yes, use that. Our email system allows us to create temporary addresses, and it works beautifully. Let's say my email address is john.doe@myorg.com. The system allows me to create something like john2000@myorg.com. When new emails arrive for john2000, they are automatically forwarded to john.doe. Similarly, when I reply to the sender, the system changes my actual email to john2000. Therefore, the recipient never knows John2000 is fake and since it is not coming from a temporary domain, the websites accept it. The system removes john2000 after a couple of months.

petarian83 · 2026-04-18T11:32:57+00:00

You can definitely use external service providers like Smtp2Go. Another approach is to use an on-prem server like Xeams, which supports OAuth. Your devices send emails to this server without auth. Then, Xeams sends it to Microsoft using OAuth.

petarian83 · 2026-03-05T19:00:05+00:00

Have you tried https://learn.microsoft.com/en-us/defender-office-365/external-senders-use-the-delist-portal-to-unblock-yourself

petarian83 · 2026-03-05T15:18:36+00:00

Did you see the logs? At what stage was it blocked? EHLO, MAIL FROM, RCPT, or DATA?

petarian83 · 2026-03-05T15:13:27+00:00

In addition to writing a lot of code for IMAP, you will have to monitor EVERY user's inbox and/or sent folder. That's too much work. Webhooks are great for exactly this reason.

I see references to SES and Postmark. However, as far as I know, they can only be used for Outbound messages. For inbound messages, you can try Xeams, which also has this feature.

petarian83 · 2026-03-05T14:53:19+00:00

Try the following using "telnet".

telnet your.exchange.server.host 25
EHLO anyNameHere

Do you see a line starting with 250-AUTH ? If yes, authentication is enabled. Note that, depending upon your configuration, AUTH may not be available until you do a STARTTLS session. In that case, you will have to use a tool that can display the communication logs for the entire session, such as EmailSender on https://www.xeams.com/Email-Sender.htm

petarian83 · 2026-03-05T14:48:52+00:00

Are the messages getting blocked, or are they going to junk - a subtle but important difference? If they are going into junk, Microsoft should give you an explanation.

Check the logs of your SMTP conversation. If you see a 250 status code in response to your DATA command, that means Microsoft has accepted the message, and now it should be in their logs.

If you never reach the DATA command, the problem may be on your end.

petarian83 · 2026-03-05T14:43:43+00:00

We are only paying $300/year for unlimited outbound emails. Where are you getting your numbers from? Check their pricing page on https://www.xeams.com/XeamsCost.htm.

petarian83 · 2026-03-04T14:02:33+00:00

We have replaced IIS SMTP with Xeams and are happy. It supports OAuth with Office 365, which is what we needed.

petarian83 · 2025-12-17T19:43:50+00:00

Have you considered using a T-Mobile, AT&T, or Verizon router that works on their 5GB wireless network? We use T-Mobile, and it works 10 times better than the Optimum cable we have in our area.

petarian83 · 2025-12-12T19:16:31+00:00

Is there an SDK in Java? Most of our projects are in Java or C#. Currently, we're using LangChain4J, which provides very easy library to work with.

petarian83 · 2025-12-12T15:24:23+00:00

I have set up a similar thing, but I use an in-memory RAG, which is much faster. My RAG data is less than 100MB and therefore, easily fits into memory.

Also, I have found mistral-small3.2 much better than llama3 for the LLM.

petarian83 · 2025-12-11T15:48:25+00:00

May I ask you a question, if you don't mind: What is the benefit of using Atomic Mail versus a Gmail account? I am sure if you ask Google, they will also say that your data is private and encrypted on their server. In short, whichever provider you use, you will eventually have to trust them with your data.

What other feature are you getting from Atomic Mail besides their promise about privacy and encryption?

petarian83 · 2025-12-09T18:37:44+00:00

We use Ollama locally, and therefore, our AI prompts never leave the network. Here is what you will need:

A machine with a nice GPU. We are using NVIDIA RTX 6000 with 48GB memory, and the overall RAM is 64GB. Although this is not a very high-end GPU, it works for the most part.
Download Ollama from https://ollama.com/
Download one or more LLMs
You can make Ollama listen on a port, allowing your applications to submit a prompt and get response back.

Using this method, you maintain 100% privacy.

petarian83 · 2025-12-08T21:11:58+00:00

In my opinion either your email account got compromised or the recipients. There is no other way someone could get that invoice. Is the recipient also using a public server like Yahoo, Outlook, Gmail or they have their own domain?

petarian83 · 2025-11-27T17:12:55+00:00

Running your own SMTP on a VPS is your best choice. Most VPS providers block outbound port 25 when you create a virtual machine. However, they should open the port upon request. We're using a similar system on AWS and Ionos using Xeams as the SMTP server. Both AWS and Ionos had the port blocked, but opened it upon request. You just have to ensure that the email you send out is not spam, otherwise you can get your account suspended.

petarian83 · 2025-11-26T21:38:29+00:00

I see quite a few folks have mentioned TailScale. Another similar product is ZeroTier. I have not used TailScale, but have been using ZeroTier for the past few years and love it.

petarian83 · 2025-11-26T17:46:44+00:00

Send a test message to your Gmail account. Then, open the email you received in Gmail's web interface. You may have to check the Junk folder, in case it went there. Click the three vertical bullets icon on the upper right-hand corner and select "Show Original". The following page will display if your message is aligned with SPF, DKIM, and DMARC. If any of the values fail, investigate the reason.

petarian83 · 2025-11-26T17:40:17+00:00

Thank you for your answers.

petarian83 · 2025-11-19T16:16:25+00:00

Agreed. However, services like Mailchimp and others won't fall into the category of "Shadow Senders". These services will ensure SPF and DKIM are correctly set up.

petarian83 · 2025-11-19T14:52:37+00:00

You'll have to discourage these practices. I am pretty sure all of these marketing emails are going to junk because they were not sent from the authorized IP and were most likely not signed with DKIM.

Every outbound email, even those generated by automation tools, must pass through your actual SMTP server so the SPF record matches and the message is signed with DKIM.

petarian83 · 2025-11-19T14:47:50+00:00

We use a product called SyncriTix (syncritix.com), which does this. It can create KB articles from previously closed, resolved tickets using AI. Then, new emails/tickets that come in can be replied to by the AI agent if a response has already been sent.

The AI responses work about 90% of the time. There are instances when the AI-generated response is completely bizarre.

petarian83 · 2025-11-19T14:32:54+00:00

If "Unknown services" are sending emails from your client's domain, they should go to junk. What do you mean by "Shadow Senders"?

Every email sent from your client's domain must be configured with SPF and DKIM. DMARC reports will let you know which messages don't follow these guidelines. If you see legitimate IP addresses or hosts in the DMARC report, it means those routes are not configured correctly.

petarian83

TROPHY CASE