use structure as suggested by @dignifiedquire

src/provider/data.rs

@@ -2,11 +2,11 @@ use crate::provider::*;
 use crate::provider::Protocol::*;
 use crate::provider::Socket::*;
 use crate::provider::UsernamePattern::*;
+use std::collections::HashMap;
 
 lazy_static::lazy_static! {
-    pub static ref PROVIDER_DATA: Vec<Provider> = vec![
+    // nauta.cu
-        Provider {
+    static ref P1: Provider = Provider {
-            domains: "nauta.cu",
             status: Status::OK,
             before_login_hint: "",
             after_login_hint: "",
@@ -15,33 +15,45 @@ lazy_static::lazy_static! {
                 Server { protocol: IMAP, socket: STARTTLS, hostname: "imap.nauta.cu", port: 143, username_pattern: EMAIL },
                 Server { protocol: SMTP, socket: STARTTLS, hostname: "smtp.nauta.cu", port: 25, username_pattern: EMAIL },
             ],
-        },
+        };
-        Provider {
+
-            domains: "outlook.com hotmail.com live.com",
+    // outlook.com, hotmail.com, live.com
+    static ref P2: Provider = Provider {
             status: Status::BROKEN,
             before_login_hint: "Outlook-e-mail-addresses will not work as expected as these servers remove some important transport information.\n\nHopefully sooner or later there will be a fix; for now, we suggest to use another e-mail-address or try Delta Chat again when the issue is fixed.",
             after_login_hint: "",
             overview_page: "https://provider.delta.chat/outlook.com",
             server: vec![
             ],
-        },
+        };
-        Provider {
+
-            domains: "testrun.org",
+    // testrun.org
+    static ref P3: Provider = Provider {
             status: Status::OK,
             before_login_hint: "",
             after_login_hint: "testrun.org is not Delta Chat :)",
             overview_page: "",
             server: vec![
             ],
-        },
+        };
-        Provider {
+
-            domains: "gmail.com googlemail.com",
+    // gmail.com, googlemail.com
+    static ref P4: Provider = Provider {
             status: Status::PREPARATION,
             before_login_hint: "For Gmail Accounts, you need to create an App-Password if you have \"2-Step Verification\" enabled. If this setting is not available, you need to enable \"Less secure apps\".",
             after_login_hint: "",
             overview_page: "https://provider.delta.chat/gmail.com",
             server: vec![
             ],
-        },
+        };
-    ];
+
+    pub static ref PROVIDER_DATA: HashMap<&'static str, &'static Provider> = [
+        ("nauta.cu", &*P1),
+        ("outlook.com", &*P2),
+        ("hotmail.com", &*P2),
+        ("live.com", &*P2),
+        ("testrun.org", &*P3),
+        ("gmail.com", &*P4),
+        ("googlemail.com", &*P4),
+    ].iter().copied().collect();
 }

src/provider/mod.rs

@@ -57,7 +57,6 @@ impl Server {
 
 #[derive(Debug)]
 pub struct Provider {
-    pub domains: &'static str,
     pub status: Status,
     pub before_login_hint: &'static str,
     pub after_login_hint: &'static str,
@@ -91,12 +90,8 @@ pub fn get_provider_info(addr: &str) -> Option<&Provider> {
     }
     .to_lowercase();
 
-    for record in PROVIDER_DATA.iter() {
+    if let Some(provider) = PROVIDER_DATA.get(domain.as_str()) {
-        for record_domain in record.domains.split(' ') {
+        return Some(*provider);
-            if record_domain == domain {
-                return Some(record);
-            }
-        }
     }
 
     None