diff --git a/src/main/java/de/ozgcloud/nachrichten/postfach/osiv2/config/ApiClientConfiguration.java b/src/main/java/de/ozgcloud/nachrichten/postfach/osiv2/config/ApiClientConfiguration.java
index b0b34b041ea119a6e5b91d9fef082f83491aacb0..6b28b57315c3cce2c26f9e88c6275fafe3f989a4 100644
--- a/src/main/java/de/ozgcloud/nachrichten/postfach/osiv2/config/ApiClientConfiguration.java
+++ b/src/main/java/de/ozgcloud/nachrichten/postfach/osiv2/config/ApiClientConfiguration.java
@@ -1,13 +1,5 @@
 package de.ozgcloud.nachrichten.postfach.osiv2.config;
 
-import java.util.Optional;
-import java.util.Set;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
-
-import jakarta.validation.ConstraintViolation;
-import jakarta.validation.Validator;
-
 import org.apache.hc.client5.http.auth.AuthScope;
 import org.apache.hc.client5.http.auth.UsernamePasswordCredentials;
 import org.apache.hc.client5.http.impl.auth.BasicCredentialsProvider;
@@ -36,7 +28,6 @@ import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
 import org.springframework.web.client.RestClient;
 
-import de.ozgcloud.common.errorhandling.TechnicalException;
 import de.ozgcloud.nachrichten.postfach.osiv2.gen.ApiClient;
 import de.ozgcloud.nachrichten.postfach.osiv2.gen.api.MessageExchangeApi;
 import de.ozgcloud.nachrichten.postfach.osiv2.gen.api.QuarantineApi;
@@ -54,8 +45,6 @@ public class ApiClientConfiguration {
 	private final Osi2PostfachProperties.ApiConfiguration apiConfiguration;
 	private final Osi2PostfachProperties.ProxyConfiguration proxyConfiguration;
 
-	private final Validator validator;
-
 	private static final String CLIENT_REGISTRATION_ID = "osi2";
 
 	@Bean
@@ -72,9 +61,8 @@ public class ApiClientConfiguration {
 	@SneakyThrows
 	ApiClient apiClient() {
 		var apiClient = new ApiClient(restClient());
-		LOG.debug("Setting api client base path to {}", apiConfiguration.getUrl());
+		LOG.info("Setting api client base path to {}", apiConfiguration.getUrl());
 		apiClient.setBasePath(apiConfiguration.getUrl());
-		validateConfiguration();
 		return apiClient;
 	}
 
@@ -95,7 +83,7 @@ public class ApiClientConfiguration {
 	private ClientHttpRequestFactory createProxyRequestFactory() {
 		var requestFactory = new HttpComponentsClientHttpRequestFactory();
 		if (proxyConfiguration.isEnabled()) {
-			LOG.debug("Using proxy configuration: {}:{}", proxyConfiguration.getHost(), proxyConfiguration.getPort());
+			LOG.info("Using proxy configuration: {}:{}", proxyConfiguration.getHost(), proxyConfiguration.getPort());
 			requestFactory.setHttpClient(
 					HttpClientBuilder.create()
 							.setProxy(new HttpHost(proxyConfiguration.getHost(), proxyConfiguration.getPort()))
@@ -111,7 +99,7 @@ public class ApiClientConfiguration {
 		var username = proxyConfiguration.getUsername();
 		var password = proxyConfiguration.getPassword();
 		if (username != null && password != null) {
-			LOG.debug("Using proxy authentication with username {}", username);
+			LOG.info("Using proxy authentication with username {}", username);
 			credentialsProvider.setCredentials(new AuthScope(proxyConfiguration.getHost(), proxyConfiguration.getPort()),
 					new UsernamePasswordCredentials(username, password.toCharArray()));
 		}
@@ -135,7 +123,7 @@ public class ApiClientConfiguration {
 	}
 
 	private ClientRegistration osi2ClientRegistration() {
-		LOG.debug("Creating client registration with clientId: {}, tokenUri: {}, scope: {}, resource: {}", authConfiguration.getClientId(),
+		LOG.info("Creating client registration with clientId: {}, tokenUri: {}, scope: {}, resource: {}", authConfiguration.getClientId(),
 				authConfiguration.getTokenUri(), authConfiguration.getScope(), authConfiguration.getResource());
 		return ClientRegistration.withRegistrationId(CLIENT_REGISTRATION_ID)
 				.clientAuthenticationMethod(ClientAuthenticationMethod.CLIENT_SECRET_POST)
@@ -182,28 +170,4 @@ public class ApiClientConfiguration {
 		});
 	}
 
-	void validateConfiguration() {
-		String violationMessage = Stream.<Optional<String>>of(getErrorMessageOfViolations(authConfiguration),
-						getErrorMessageOfViolations(apiConfiguration),
-						proxyConfiguration.isEnabled() ? getErrorMessageOfViolations(proxyConfiguration) : Optional.empty()
-				).flatMap(Optional::stream)
-				.collect(Collectors.joining(System.lineSeparator()));
-
-		if (!violationMessage.isEmpty()) {
-			throw new TechnicalException(
-					"Configuration of api client is invalid:%s%s".formatted(System.lineSeparator(), violationMessage));
-		}
-	}
-
-	private <T> Optional<String> getErrorMessageOfViolations(T configuration) {
-		return formatConstraintValidation(validator.validate(configuration))
-				.map(message -> "%s is invalid: %s".formatted(configuration.getClass().getSimpleName(), message));
-	}
-
-	private <T> Optional<String> formatConstraintValidation(Set<ConstraintViolation<T>> constraints) {
-		return constraints.stream()
-				.map(violation -> String.format("%s: %s", violation.getPropertyPath(), violation.getMessage()))
-				.reduce((a, b) -> a + ", " + b);
-	}
-
 }
diff --git a/src/test/java/de/ozgcloud/nachrichten/postfach/osiv2/config/ApiClientConfigurationTest.java b/src/test/java/de/ozgcloud/nachrichten/postfach/osiv2/config/ApiClientConfigurationTest.java
deleted file mode 100644
index 0917893c984df45a9880a7f2847391931752a54d..0000000000000000000000000000000000000000
--- a/src/test/java/de/ozgcloud/nachrichten/postfach/osiv2/config/ApiClientConfigurationTest.java
+++ /dev/null
@@ -1,142 +0,0 @@
-package de.ozgcloud.nachrichten.postfach.osiv2.config;
-
-import static org.assertj.core.api.Assertions.*;
-
-import java.util.List;
-import java.util.stream.Stream;
-
-import jakarta.validation.Validation;
-import jakarta.validation.Validator;
-
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Nested;
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.Arguments;
-import org.junit.jupiter.params.provider.MethodSource;
-
-import de.ozgcloud.common.errorhandling.TechnicalException;
-
-class ApiClientConfigurationTest {
-
-	private static final Validator VALIDATOR;
-
-	static {
-		try (var factory = Validation.buildDefaultValidatorFactory()) {
-			VALIDATOR = factory.getValidator();
-		}
-	}
-
-	@DisplayName("validate configuration")
-	@Nested
-	class TestValidateConfiguration {
-
-		@DisplayName("should return if is valid")
-		@Test
-		void shouldReturnIfIsValid() {
-			var validator = new ApiClientConfiguration(
-					createAuthConfiguration(),
-					createApiConfiguration(),
-					createProxyConfiguration(),
-					VALIDATOR
-			);
-
-			assertThatCode(validator::validateConfiguration).doesNotThrowAnyException();
-		}
-
-		@DisplayName("should return if is valid with disabled proxy")
-		@Test
-		void shouldReturnIfIsValidWithDisabledProxy() {
-			var validator = new ApiClientConfiguration(
-					createAuthConfiguration(),
-					createApiConfiguration(),
-					createDisabledProxyConfiguration(),
-					VALIDATOR
-			);
-
-			assertThatCode(validator::validateConfiguration).doesNotThrowAnyException();
-		}
-
-		static Stream<Arguments> invalidValidatorConfigurations() {
-			return Stream.of(
-					Arguments.of(
-							new Osi2PostfachProperties.AuthConfiguration(),
-							createApiConfiguration(),
-							createProxyConfiguration()
-					),
-					Arguments.of(
-							createAuthConfiguration(),
-							new Osi2PostfachProperties.ApiConfiguration(),
-							createProxyConfiguration()
-					),
-					Arguments.of(
-							createAuthConfiguration(),
-							createApiConfiguration(),
-							createInvalidProxyConfiguration()
-					)
-			);
-		}
-
-		@DisplayName("should throw exception if is invalid")
-		@ParameterizedTest
-		@MethodSource("invalidValidatorConfigurations")
-		void shouldThrowExceptionIfIsInvalid(
-				Osi2PostfachProperties.AuthConfiguration authConfiguration,
-				Osi2PostfachProperties.ApiConfiguration apiConfiguration,
-				Osi2PostfachProperties.ProxyConfiguration proxyConfiguration
-		) {
-			var validator = new ApiClientConfiguration(
-					authConfiguration,
-					apiConfiguration,
-					proxyConfiguration,
-					VALIDATOR
-			);
-
-			assertThatThrownBy(validator::validateConfiguration)
-					.isInstanceOf(TechnicalException.class)
-					.hasMessageContaining("is invalid");
-		}
-
-		private static Osi2PostfachProperties.ApiConfiguration createApiConfiguration() {
-			var conf = new Osi2PostfachProperties.ApiConfiguration();
-			conf.setUrl("http://localhost:8080");
-			conf.setTenant("tenant");
-			conf.setNameIdentifier("abc");
-			return conf;
-		}
-
-		private static Osi2PostfachProperties.AuthConfiguration createAuthConfiguration() {
-			var conf = new Osi2PostfachProperties.AuthConfiguration();
-			conf.setClientId("clientId");
-			conf.setClientSecret("clientSecret");
-			conf.setScope(List.of("scope"));
-			conf.setTokenUri("http://localhost:8081");
-			conf.setResource("resource");
-			return conf;
-		}
-
-		private static Osi2PostfachProperties.ProxyConfiguration createProxyConfiguration() {
-			var conf = new Osi2PostfachProperties.ProxyConfiguration();
-			conf.setEnabled(true);
-			conf.setHost("localhost");
-			conf.setPort(8080);
-			return conf;
-		}
-
-		private static Osi2PostfachProperties.ProxyConfiguration createDisabledProxyConfiguration() {
-			var conf = new Osi2PostfachProperties.ProxyConfiguration();
-			conf.setEnabled(false);
-			return conf;
-		}
-
-		private static Osi2PostfachProperties.ProxyConfiguration createInvalidProxyConfiguration() {
-			var conf = new Osi2PostfachProperties.ProxyConfiguration();
-			conf.setEnabled(true);
-			conf.setHost("localhost");
-			conf.setPort(null);
-			return conf;
-		}
-
-	}
-
-}
\ No newline at end of file