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can i make an application to receive mails in C# ?

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As already said, you can absolutely build a mail client in C#. As noted, you can also build a mail server — but that is a much bigger task with DNS, spam and TLS considerations. Decide first whether you need a client that talks to existing providers (Gmail, Outlook, company IMAP/POP3) or you need to accept inbound mail for a domain (run an SMTP/POP/IMAP server).

For a client, use an existing, maintained library instead of implementing IMAP/POP3 yourself. A recommended choice is MailKit (NuGet package MailKit) which supports IMAP, POP3 and SMTP and works with MimeKit for parsing messages. A minimal IMAP example:

using MailKit.Net.Imap;
using MailKit;
using MimeKit;

using (var client = new ImapClient())
{
    client.Connect("imap.example.com", 993, true);
    client.Authenticate("username", "password"); // or use OAuth2 for providers that require it
    client.Inbox.Open(FolderAccess.ReadOnly);
    var msg = client.Inbox.GetMessage(0);
    Console.WriteLine(msg.Subject);
    client.Disconnect(true);
}

Notes and common pitfalls: IMAP (recommended) keeps mail synced across devices; POP3 usually downloads and can remove mail by default. Many providers (Gmail, Office365) require OAuth2 or app-specific passwords now, so plain username/password may fail. Always use TLS (ports 993 for IMAP over SSL, 995 for POP3 over SSL). Do not disable certificate validation in production.

If you plan to run a server, expect extra operational work: MX records, reverse DNS, SPF/DKIM/DMARC, TLS certificates, anti-spam, and storage/backup. For quick integration with Microsoft 365 or Outlook.com, consider their API (Microsoft Graph) instead of raw IMAP/POP3. For troubleshooting, check firewall/ISP port blocks, provider settings (enable IMAP), and inspect logs or use openssl/telnet to verify connectivity.

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