A lot of mail servers just outright block residential IP blocks.
For outbound mail, I use a tiny vultr VM on their cheapest tier. They require you to ask to open outbound port 25 and promise to follow sensible rules, and will close it if you don’t, and that seems to give them a good enough reputation that you don’t get automatically blocked (then you’re relying on domain reputation).
David Chisnall (*Now with 50% more sarcasm!*)
npub13g…dk50d
2026-10-30 08:46:58 UTC
in reply to nevent1q…zyu2
Author Public Key
npub13gcwraghdcw9xzkg3tky24feu0lzkhtlt57wpdn58y4m4tyr9qdsxdk50dSeen on
wss://relay.momostr.pinkPublished at
2026-10-30 08:46:58 UTCEvent JSON
{
"id": "4560ac510c08c3154ebf7d567ee434fd7200a48c3f69f7382dd423490a8b6765",
"pubkey": "8a30e1f5176e1c530ac88aec455539e3fe2b5d7f5d3ce0b674392bbaac83281b",
"created_at": 1793350018,
"kind": 1,
"tags": [
[
"e",
"cc58edad9aba46408cf70ff9b1b9bfc4145f2257f16d3be94bf48f1a3f43ac12",
"",
"root",
"7dc8f76265eb250a7ea53f66a4fa6bea65aadd26eb0e52d5b31039788736fe25"
],
[
"p",
"3e16e51e62f739002bf6ac0d2253943cb05ec5adeb6d55c43023cab0f68f7a29"
],
[
"p",
"d5905fb840b4077ec0c05f603c928db8bcdb13833e8cbe05cf3f48608416957d"
],
[
"e",
"b41178a2fba7d63c36a0b2b2f5019812c1d8fe4f4e6129940cbbfce9c820a0eb",
"",
"reply",
"3e16e51e62f739002bf6ac0d2253943cb05ec5adeb6d55c43023cab0f68f7a29"
],
[
"proxy",
"https://infosec.exchange/@david_chisnall/117528986818360673",
"web"
],
[
"p",
"7dc8f76265eb250a7ea53f66a4fa6bea65aadd26eb0e52d5b31039788736fe25"
],
[
"p",
"215e73fb33e912bab7bb81306edc5c774fe930d165c608fb1eab9a26158d4330"
],
[
"proxy",
"https://infosec.exchange/users/david_chisnall/statuses/117528986818360673",
"activitypub"
],
[
"L",
"pink.momostr"
],
[
"l",
"pink.momostr.activitypub:https://infosec.exchange/users/david_chisnall/statuses/117528986818360673",
"pink.momostr"
],
[
"-"
]
],
"content": "A lot of mail servers just outright block residential IP blocks.\n\nFor outbound mail, I use a tiny vultr VM on their cheapest tier. They require you to ask to open outbound port 25 and promise to follow sensible rules, and will close it if you don’t, and that seems to give them a good enough reputation that you don’t get automatically blocked (then you’re relying on domain reputation).",
"sig": "4b0fee303b2773b0b73465e8e8d4cb17f4008f23662bdf041a4dce3145ab52519bf3944f54357f3df7d3bd820c14781396dc60fb84bd2c0f5ab89aee30f45e8c"
}