Is this only aws?

[yk-eta]

look like the to variable must be array?

ArgumentError
expected params[:destination][:to_addresses] to be an Array, got class String instead.

/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/param_validator.rb:35:in 'Aws::ParamValidator#validate!'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/param_validator.rb:15:in 'Aws::ParamValidator.validate!'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/param_validator.rb:25:in 'Aws::Plugins::ParamValidator::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/logging.rb:43:in 'Aws::Plugins::Logging::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/seahorse/client/plugins/raise_response_errors.rb:16:in 'Seahorse::Client::Plugins::RaiseResponseErrors::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/checksum_algorithm.rb:167:in 'Aws::Plugins::ChecksumAlgorithm::OptionHandler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/jsonvalue_converter.rb:16:in 'Aws::Plugins::JsonvalueConverter::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/invocation_id.rb:16:in 'Aws::Plugins::InvocationId::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/idempotency_token.rb:19:in 'Aws::Plugins::IdempotencyToken::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/param_converter.rb:26:in 'Aws::Plugins::ParamConverter::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/seahorse/client/plugins/request_callback.rb:89:in 'Seahorse::Client::Plugins::RequestCallback::OptionHandler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/response_paging.rb:12:in 'Aws::Plugins::ResponsePaging::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/seahorse/client/plugins/response_target.rb:24:in 'Seahorse::Client::Plugins::ResponseTarget::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-rails-5.1.0/lib/aws/rails/notifications.rb:22:in 'block in Aws::Rails::Notifications::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/activesupport-8.0.4/lib/active_support/notifications.rb:212:in 'ActiveSupport::Notifications.instrument'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-rails-5.1.0/lib/aws/rails/notifications.rb:21:in 'Aws::Rails::Notifications::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/telemetry.rb:39:in 'block in Aws::Plugins::Telemetry::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/telemetry/no_op.rb:29:in 'Aws::Telemetry::NoOpTracer#in_span'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/telemetry.rb:53:in 'Aws::Plugins::Telemetry::Handler#span_wrapper'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/aws-sdk-core/plugins/telemetry.rb:39:in 'Aws::Plugins::Telemetry::Handler#call'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-core-3.243.0/lib/seahorse/client/request.rb:72:in 'Seahorse::Client::Request#send_request'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-sdk-sesv2-1.96.0/lib/aws-sdk-sesv2/client.rb:5718:in 'Aws::SESV2::Client#send_email'"
/xxxx/bundler_home/ruby/3.4.0/gems/aws-actionmailer-ses-1.0.0/lib/aws/action_mailer/ses_v2/mailer.rb:38:in 'Aws::ActionMailer::SESV2::Mailer#deliver!'"
/xxxx/bundler_home/ruby/3.4.0/gems/mail-2.9.0/lib/mail/message.rb:2148:in 'Mail::Message#do_delivery'"
/xxxx/bundler_home/ruby/3.4.0/gems/mail-2.9.0/lib/mail/message.rb:253:in 'block in Mail::Message#deliver'"
/xxxx/bundler_home/ruby/3.4.0/gems/actionmailer-8.0.4/lib/action_mailer/base.rb:595:in 'block in ActionMailer::Base.deliver_mail'"
/xxxx/bundler_home/ruby/3.4.0/gems/activesupport-8.0.4/lib/active_support/notifications.rb:212:in 'ActiveSupport::Notifications.instrument'"
/xxxx/bundler_home/ruby/3.4.0/gems/actionmailer-8.0.4/lib/action_mailer/base.rb:593:in 'ActionMailer::Base.deliver_mail'"
/xxxx/bundler_home/ruby/3.4.0/gems/mail-2.9.0/lib/mail/message.rb:253:in 'Mail::Message#deliver'"
/xxxx/app/services/send_email_service.rb:6:in 'SendEmailService.send_mail'"

[richardwang1124]

Hey @yk-eta, from the AWS SES API docs it seems like to_addresses (ToAddresses) must be an array of strings. You should be able to fix this error by wrapping your address in an array (e.g to_addresses: "recipient@example.com" → to_addresses: ["recipient@example.com"]).