I want to write an application which can receive emails locally and can response with successful and error responses.
After reading some tutorials about how SMTP works I was trying to send an email using telnet to my locally running SMTP server.
Connect to SMTP server
HELO/EHLO command
AUTH ...
MAIL from command
RCPT to command
DATA command
write somedata
QUITE
What I couldn't understand is step 3. Why do I need to be authenticated to send an email to localhost. I mean if I am yahoo user and I have to send an email to gmail user, how can I be authenticated to gmail SMTP server?
SMTP Auth is used to authenticate the send email. SMTP AUTH authenticates you directly with our SMTP server. This is transparent to you as a user.
SMTP is the protocol (the language) your email program uses to send email through our email server. AUTH is the part of that protocol that is used to verify that you are one of our users.
SMTP authentication allows the client to show the server that this client has permission to relay e-mail through this server.
In most cases, you can send without authentication to local e-mail addresses of this domain
(i.e. send from bob#domain.com to alice#domain.com)
because the server does not need to relay your e-mail to external servers. Authentication is required whenever the recipient is not of a local domain
(i.e. send from joe#company.com to tom#example.com, provided that
company.com and example.com use different e-mail servers).
If you want to read more about this Here I find the some reference where it explain very clearly.
http://www.afterlogic.com/mailbee-net/docs/smtp_authentication.html
http://www.softhome.net/help/faq/smtp-auth.html
Hope this can help full for you.
SMTP AUTH protects the server from unauthorized use. For example, Google doesn't allow people to send email from Google's email servers unless they have an account. You prove that you have an account (or that you are somehow authorized to use their servers) by authenticating with the AUTH command.
Maybe an example where the email service isn't free would be more clear. If you are trying to send email using GoDaddy's email servers, but you don't have an account, they will prevent you from doing it. GoDaddy charges people to use their services.
If you are running a company called mycompany.com, and you run your own mail servers, you don't want every spammer in the world using your servers to send email out of your company. You require senders to authenticate using AUTH in order to protect your servers from unauthorized use.
Related
i have many application servers (cyber-ark, SIEM solution, forti gate etc') installed on azure as a IaaS.
all of them connect to an smtp server in order to send notifications via mail.
on my on Prem deployments, this was not an issue, but on azure, all smtp communication seems to be blocked.
i created a send-grid account and tried playing with it, but the send grid smtp server is getting blocked too.
what is the right way to work in this scenario ?
i need a smtp server to integrate with my applications...
what should i do ?
thanks,
david
Depends on your type of subscription, pay-as-you-go if you want the ability to send email from Azure VMs directly to external email providers (not using an authenticated SMTP relay), you can make a request to remove the restriction. Requests will be reviewed and approved at Microsoft's discretion, and they'll be granted only after additional anti-fraud checks are made. To make a request, open a support case by using the following issue type: Technical > Virtual Network > Connectivity > Cannot send email (SMTP/Port 25). Make sure that you add details about why your deployment has to send mail directly to mail providers instead of using an authenticated relay. More details
I would like to secure my servers for incoming traffic from BigCommerce.
BigCommerce allows for configuring a 3rd party email server
as well as webhooks. What are the addresses that will be used by these services?
We can't guarantee that webhooks will be sent from a specific block of IPs--those addresses can change any time and without notice. But if the purpose is to confirm that incoming webhooks are coming from BigCommerce, you can specify custom headers when creating your webhook. The headers are returned in the webhook payload, so you could set the custom header to a basic auth username/password, and check that at runtime to authenticate the POST.
We do have a list of IPs that I can send you for the SMTP server. Happy to connect by email if your contact info is still the same!
I'm using node.js smtp-server module to create local smtp server on my localhost.
But when I want to connect to another smpt server (e.g gmail) from my local smtp server it requires authentication. I just want to send email to any gmail account and don't want to login to my gmail account!
Any help?
Your local SMTP server should be able to send email to the Google MX servers without authentication, provided that you are sending email to an address #gmail.com. To get a list of MX servers you would have to do a DNS lookup on gmail.com for records of type MX. If you are trying to connect to other Google SMTP servers (other than their listed MX servers) this may not work so be sure to connect to the MX servers.
I have an application which sends an email if an error occurs. I am using gmail account as from and to address. But when I run my program it gives me authentication required error. I got an email from google saying Sign-In attempt prevented. I also signed in for app password but it just worked once. When I see the apps connected to my account, the list is empty. How can connect app to my gmail account? How can I have this application access gmail account to send email.
You can try to use the SMTP server of GMail to send e-mails.
SMTP server address: smtp.gmail.com
SMTP user name: Your full Gmail address (e.g. example#gmail.com)
SMTP password: Your Gmail password
With Gmail 2-step authentication enabled, use an application-specific Gmail password.
SMTP port (TLS): 587
SMTP port (SSL): 465
SMTP TLS/SSL required: yes
You can let your application access your Gmail account by turning on "Access for less secure apps" to lower the security level.
It's a setting on the "My Account" page under Sign-in security. The link https://www.google.com/settings/security/lesssecureapps should take you there.
In control panel there is a option to turn on certain features that are not installed by default. When you turn on IIS feature it has an option called smtp email. Does it refer to smtp service or smtp server? I have looked for the answer. But there is no concrete answer. Some say it's a service others say it refers to server. Can anyone please help me with the confusion??
The SMTP service under IIS is a simple relay agent. You really cannot use it as a mail server, as there is no real interface for retrieving (reading) emails from that service.
You typically use the SMTP service as a sending buffer for outgoing emails generated by your server (e.g. website). You configure the SMTP service as a relay for outgoing emails (e.g. to a smarthost) and then you can have your website generate emails to the local SMTP service. This way your website is not affected if network or other server problems would affect mail sending, as the SMTP service queues the emails you generate and can automatically retry deliveries etc.