blog: postfix: remove old notes from the HTML output (thanks Ben)

content/blog/2022-04-05-systemd-nspawn-postfix.md

@@ -295,80 +295,3 @@ then you can stop the machine, restart it, and administer it:
 ```
 
 you now have a postfix instance which starts on boot and can send/receive mail as long as port 25 is accessible. later on you may want to provide client access in a friendlier way than directly reading the spool or invoking `sendmail`. that could be done by installing something like [dovecot](https://en.wikipedia.org/wiki/Dovecot_\(software\)).
-
-<!--
-Notes:
-  https://wiki.archlinux.org/title/OpenDMARC
-  gmail.com has port 25 open, but not 465 nor 587. so it probably only does plain SMTP with STARTTLS
-  *inbound* port 25 is blocked, so i can't *receive* email
-
-VPN?
-  https://tunnelbroker.net/
-    FREE IPv6 tunnel
-    pairs with a free DNS & reverse-DNS service
-    they block output SMTP 25 by default, but will unblock that on case-by-case
-      looks like they block both directions: https://forums.he.net/index.php?topic=3084.0
-    Hurricane Electric operates in the Westin
-      and Fremont, CA :thinking:
-      VERY well-established; Mike Leber
-      organically grown, privately held & against selling equity or exits
-        https://www.telecomramblings.com/2015/06/industry-spotlight-hurricane-electric-ceo-mike-leber/
-  https://en.wikipedia.org/wiki/List_of_IPv6_tunnel_brokers
-    tunnelbroker.se offers wireguard + RDNS + BGP
-    August Internet offers wireguard + RDNS + BGP
-
-  https://hoppy.network/
-    explicitly allows port 25; dedicated and clean IPv4 address, /56 block of IPv6; $8/mo
-  https://www.ovpn.com/en/features/public-ipv4
-    IPv4 addr -- with PTR -- for $3/mo + $5-7/mo VPN service.
-    explicitly mentions email support.
-    allows BTC payments; claims anonymity in the process; email is OPTIONAL when registering
-    people recommend it for SMTP: https://www.reddit.com/r/homelab/comments/9fo287/comment/e5za2qk/?utm_source=share&utm_medium=web2x&context=3
-    traffic neutral; allows bt/etc: https://www.ovpn.com/en/faq/functionality/does-ovpn-allow-file-sharingp2pbittorrentutorrent
-     4 connections per account
-  purevpn:
-    also allows port-forwarding + static IP for $3.50 above base; claims PTR records
-      https://support.purevpn.com/how-can-i-access-ptr-record-service
-    accepts BTC
-    $2-$11/mo base price
-  https://www.perfect-privacy.com
-    *maybe* supports explicitly port-forwarding. $10-12/mo.
-  Vultr reverse proxy
-
-MX forwarder?
-  https://ghettosmtp.com/
-    receive only, budgeted to 2000 mails/month
-    no outbout SMTP, except FAQ #13 mentions a secret test/beta
-    manual activation, by emailing them & asking access.
-  https://www.dynu.com/Email  ($10/yr forwarder)
-  https://rollernet.us  ($30/yr forwarder; 25MB/day volume)
-  https://www.dnsexit.com/Direct.sv?cmd=mailRedirect
-    $25/yr; no account limit. requires port 26 or 940
-  mailgun
-    free for small volume?
-  Mandrill
-  SendGrid
-  SMTP2Go
-  Amazon SES/lambda
-    https://github.com/arithmetric/aws-lambda-ses-forwarder
-    i think Amazon has to store my emails, and then the lambda is invoked to forward it to my MX.
-    unless i have a static IP, i believe this is the case for any way of routing mail.
-
-  gmail:
-    operates a SMTP relay: https://support.google.com/a/answer/176600?hl=en
-
-  CenturyLink might allow outbound email via their OWN forwarder?
-  ~~forward via UW? HAK5 pineapple?~~
-
-CenturyLink:
-  https://www.centurylink.com/home/help/internet/email/understanding-port-25-filtering.html
-    require static IP to disable port 25 filtering.
-    can get a static IP as a residential customer
-      costs $5/mo or $10/mo? https://www.centurylink.com/home/help/notices/staticip.html
-        https://www.reddit.com/r/centurylink/comments/ij1f3j/how_much_is_a_static_ip_address/
-  i can reach MX 587 (submission), but not 25:
-    $ nmap -sT lxomp51w.centurylink.com.
-  port 25 shows "filtered"
-    $ nmap -sT -p 25 lxomp51w.centurylink.com.
-
--->