docs(email): fix webmail-reachability note and outgoing SMTP port guidance

- Webmail is hosted at our address (the Webmail button opens it directly), so
  it does not depend on the customer's domain/DNS. Replaced the incorrect
  "DNS still propagating" troubleshooting note.
- Outgoing SMTP: lead with port 465 (SSL/TLS) as the standard and present 587
  (STARTTLS) as the alternate submission port; note that port 25 is for
  server-to-server and shouldn't be used from a mail client. Updated the
  IMAP-but-not-SMTP troubleshooting entry to match.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/content/docs/whp/how-to/create-an-email-account.mdx

@@ -82,12 +82,14 @@ IMAP (incoming)
 
 SMTP (outgoing)
   Host:     <see Setup Instructions>
-  Port:     587
-  Security: STARTTLS
+  Port:     465
+  Security: SSL/TLS
   Username: full email address
   Password: same as IMAP
 ```
 
+For outgoing mail, **port 465 with SSL/TLS** is the standard. If your client prefers STARTTLS, **port 587** is the alternate submission port. (Don't use port 25 from a mail client — it's for server-to-server delivery and most networks block it.)
+
 For per-client walkthroughs (Outlook, Apple Mail, Thunderbird, etc.), see the Email clients section — coming soon.
 
 ## Webmail
@@ -104,11 +106,11 @@ Send yourself a test message from another account (your personal Gmail, for exam
 
 ## Troubleshooting
 
-**Webmail isn't reachable.** DNS for the mail subdomain may still be propagating — wait an hour and try again.
+**Webmail isn't reachable.** Webmail is hosted at our address — the **Webmail** button on the Email page opens it directly — so it doesn't depend on your domain or its DNS. If it doesn't load, it's almost always a temporary connection issue: try again in a few minutes or from another network, and open a support ticket if it persists.
 
 **Outgoing mail is bouncing or going to spam.** Check the SPF and DKIM records. The **DKIM Management** section on the **Email Domains (DNS)** tab shows whether DKIM is configured for each of your domains.
 
-**Client can connect on IMAP but not SMTP.** Some ISPs and corporate networks block outgoing port 587. Try sending from a different network to confirm; if the issue is your network, your ISP is the place to ask.
+**Client can connect on IMAP but not SMTP.** Some ISPs and corporate networks block outgoing mail ports. If sending fails on port 465, try the alternate submission port **587** (STARTTLS); if both fail, test from a different network to confirm it's your network, and if so, your ISP is the place to ask.
 
 ## Related